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Πέμπτη 30 Μαρτίου 2017

DARK MATTER AND MODIFIED GRAVITY - SEAN CARROLL

             

DARK MATTER AND MODIFIED GRAVITY  - SEAN CARROLL



ANAΡΤΗΣΗ ΑΠΟ ΤΟ YOUTUBE 31/3/2017
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Particles, Fields and The Future of Physics - A Lecture by Sean Carroll

                



Particles, Fields and The Future of Physics - A Lecture by Sean Carroll

Δημοσιεύτηκε στις 11 Ιουλ 2013

Sean Carroll of CalTech speaks at the 2013 Fermilab Users Meeting.
Audio starts at 19 sec, Lecture starts at 2:00
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Planck's Constant and The Origin of Quantum Mechanics | Space Time | PBS...

                 

Planck's Constant and The Origin of Quantum Mechanics | Space Time | PBS...



Δημοσιεύτηκε στις 22 Ιουν 2016
To check out any of the lectures available from Great Courses Plus go to http://ow.ly/K9mK301cRdj and get ready to learn about everything from cooking to calculus.

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Planck's
Length is the length below which the concept of length loses its
meaning. What exactly does that mean and what are the incredible
implications this fact has upon our reality? To find out check out this
episode of Space Time where Matt digs into the early history of quantum
mechanics.

Written and hosted by Matt O’Dowd

Made by Kornhaber Brown (www.kornhaberbrown.com)

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ANAΡΤΗΣΗ ΑΠ Ο ΤΟ  YOUTUBE 31/3/2017


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How to Learn Faster with the Feynman Technique (Example Included)

                 

How to Learn Faster with the Feynman Technique (Example Included)

Δημοσιεύτηκε στις 7 Φεβ 2017

If
you want to cut your study time, using the Feynman Technique is a great
way to do it. Named after the physicist Richard Feynman, it revolves
around explaining a concept in simple language as if you were teaching
it to someone else.

In this video, I'll show you exactly how to use the Feynman Technique.

Want examples? You can find them here:

https://collegeinfogeek.com/feynman-t...

My book "10 Steps to Earning Awesome Grades" is completely free, so check it out if you're interested in improving your grades!

http://collegeinfogeek.com/get-better...

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Videos you might want to watch next:

5 Tips for Acing Multiple Choice Tests: https://www.youtube.com/watch?v=Q1y8c...

The Most Powerful Way to Remember What You Study: https://www.youtube.com/watch?v=eVajQ...

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If
you want to get even more strategies and tips on becoming a more
productive, successful student, subscribe to my channel right here:

http://buff.ly/1vQP5ar

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Coronal Holes, Storm Alert, Top News | S0 News Mar.30.2017

              

Coronal Holes, Storm Alert, Top News | S0 News Mar.30.2017



ANAΡΤΗΣΗ ΑΠΟ ΤΟ YOUTUBE 31/3/2017


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Τετάρτη 29 Μαρτίου 2017

The Beginning And End Of The Universe S01 E02

                  

The Beginning And End Of The Universe S01 E02

Δημοσιεύτηκε στις 11 Απρ 2016

In
this second part, Professor Jim Al-Khalili carries us into the distant
future to try to discover how the universe will end - with a bang or a
whimper? He reveals a universe far stranger than anyone imagined and, at
the frontier of our understanding, encounters a mysterious and
enigmatic force that promises to change physics forever
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The Beginning And End Of The Universe S01 E01

                         

The Beginning And End Of The Universe S01 E01

Δημοσιεύτηκε στις 11 Απρ 2016
Professor
Jim Al-Khalili takes us back in time to tackle the greatest question in
science: how did the universe begin? Uncovering the origins of the
universe is regarded as humankind's greatest intellectual achievement.
By recreating key experiments Jim unravels the cosmic mystery of
science's creation story before witnessing a moment, one millionth of a
second, after the universe sprang into existence.
ANAΡΤΗΣΗ ΑΠΟ ΤΟ YOUTUBE 30/3/2017


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THE SECRET YOU HAVE NEVER KNOWN BEFORE IN THE UNIVERSE DOCUMENTARY

                  

THE SECRET YOU HAVE NEVER KNOWN BEFORE IN THE UNIVERSE DOCUMENTARY

Δημοσιεύτηκε στις 19 Ιαν 2017

On
our channel a lot of interesting documentaries on such themes: to
destroy the Land, kill the Earth, end of Earth, the death Land, death
Land, doomsday, Armageddon, Apocalypse, space, about space, star, stars,
universe, galaxy, big Bang the big Bang theory, constellation, planet,
solar system, satellite, UFO, aliens, Earth, planet Earth, Moon, Mars,
Jupiter, Venus, Saturn, Uranus, Neptune, Pluto, mercury, astronaut,
rocket, meteor, comet, astronomy, matter, quasar, telescope, meteor,
Infinity, planets, Sun, Hubble, asteroid, documentary, black hole,
quasar, national geographic documentary, full documentary, discovery
documentary, history documentary, bbc documentary, national geographic,
the universe, discovery channel, stephen hawking, brian greene, Neil
deGrasse Tyson
ANAΡΤΗΣΗ ΑΠΟ ΤΟ YOUTUBE 30/3/2017
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Public Lecture | Supernovas: Gravity-powered Neutrino Bombs

                      

Public Lecture | Supernovas: Gravity-powered Neutrino Bombs

Δημοσιεύτηκε στις 1 Φεβ 2016
Imagine
taking a ball of hot plasma more massive than the sun and suddenly
compressing it to a super-dense object the size of a city. This sounds
like science fiction, yet it is exactly what happens in the centers of
massive stars, causing them to explode so violently that they briefly
release as much light as an entire galaxy. These supernova explosions
have shaped the universe as we know it and created many of the chemical
elements around us. It turns out that tiny, elusive elementary particles
called neutrinos play a crucial role in these explosions. Only two
dozen supernova neutrinos have ever been detected, but thousand more are
expected to be seen in giant underground detectors of the future. This
lecture describes the part neutrinos play in one of the universe’s most
dramatic events, and outline what scientists expect to learn by
capturing bursts of neutrinos from the next galactic supernova.

About the Speaker:

Alex
Friedland studied physics first at the Moscow Institute of Physics and
Technology and later as a graduate student at the University of
California, Berkeley. He became fascinated with neutrinos from supernova
explosions while a postdoctoral researcher at the Institute for
Advanced Study in Princeton, NJ. He continued exploring the rich physics
of supernova neutrinos at Los Alamos National Laboratory, first as a
Richard P. Feynman Fellow and then as a permanent staff scientist. In
2015 Friedland became a senior staff scientist at SLAC, where he
explores neutrinos in the lab, in stars and in the early universe and
pursues broader questions in particle physics and astrophysics.
ANAΡΤΗΣΗ ΑΠΟ ΤΟ YOUTUBE 30/3/2017

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How Time Becomes Space Inside a Black Hole | Space Time

                 

How Time Becomes Space Inside a Black Hole | Space Time

Δημοσιεύτηκε στις 29 Μαρ 2017

Find out how time and space switch roles when we move beyond the event horizon of the black hole. And try Crunchyroll at https://www.crunchyroll.com/spacetime

You can further support us on Patreon at https://www.patreon.com/pbsspacetime
Get your own Space Time t­shirt at http://bit.ly/1QlzoBi
Tweet at us! @pbsspacetime
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Referenced Videos:

What Happens at the Event Horizon
https://www.youtube.com/watch?v=mht-1...

The Phantom Singularity
https://www.youtube.com/watch?v=-q7Ev...

The Geometry of Causality
https://www.youtube.com/watch?v=1YFrI...

Previous Episode:
Superluminal Time Travel
https://www.youtube.com/watch?v=HUMGc...

Help translate our videos! https://www.youtube.com/timedtext_cs_...

Written and Hosted by Matt O’Dowd
Produced by Rusty Ward
Graphics by Grayson Blackmon
Made by Kornhaber Brown (www.kornhaberbrown.com)

Comments answered by Matt:
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Dankulous Memelord III
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ANAΡΤΗΣΗ ΑΠΟ ΤΟ  YOUTUBE 30/3/2017
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M6.6 Earthquake, Inside Earth, Storm Watch | S0 News Mar.29.2017

        

M6.6 Earthquake, Inside Earth, Storm Watch | S0 News Mar.29.2017



ΑΝΑΡΤΗΣΗ ΑΠΟ ΤΟ YOUTUBE 30/3/2017
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Τρίτη 28 Μαρτίου 2017

BBC Documentary Atom 3 | The Illusion of Reality Science Documentary

                 

BBC Documentary Atom 3 | The Illusion of Reality Science Documentary 

Δημοσιεύτηκε στις 11 Νοε 2015

BBC Documentary Atom 3 | The Illusion of Reality Science Documentary
bbc documentary 2015,
bbc documentary history,
bbc documentary extraordinary people,
bbc documentary science,
bbc documentary nature,
bbc documentary 2015 history,
bbc documentary india,
bbc documentary china,
bbc documentary 2015 science,
bbc documentary hd,
bbc documentary atom,
bbc documentary art
ANAΡΤΗΣΗ ΑΠΟ ΤΟ YOUTUBE 28/3/2017
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What Darwin Never Knew NOVA HD

              

What Darwin Never Knew NOVA HD

Δημοσιεύτηκε στις 6 Δεκ 2014

Earth
teems with a staggering variety of animals. The source of life's
endless forms was a profound mystery until Charles Darwin's
revolutionary idea of natural selection. NOVA reveals answers to the
riddles that Darwin couldn't explain. Stunning breakthroughs in a brand
new science nicknamed 'evo devo' are linking the enigma of origins to
another of nature's great mysteries, the development of an embryo.
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Public Lecture—Water: The Strangest Liquid

              

Public Lecture—Water: The Strangest Liquid



Ανέβηκε στις 9 Φεβ 2011
Lecture
Date: Tuesday, February 24, 2009. Water, H2O, is familiar to everyone -
it shapes our bodies and our planet. But despite its abundance, water
has remained a mystery, exhibiting many strange properties that are
still not understood. Why does the liquid have an unusually large
capacity to store heat? And why is it denser than ice? Now, using the
intense X-ray beams from particle accelerators, investigations into
water are leading to fundamental discoveries about the structure and
arrangement of water molecules. This lecture will elucidate the many
mysteries of water and discuss current studies that are revolutionizing
the way we see and understand one of the most fundamental substances of
life. Lecturer: Prof. Anders Nilsson, SLAC National Accelerator
Laboratory.
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Solar Flares, Earthquakes, Electric News | S0 News Mar.28.2017

                  



Solar Flares, Earthquakes, Electric News | S0 News Mar.28.2017

ANAΡΤΗΣΗ ΑΠΟ ΤΟ YOUTUBE 28/3/2017
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The Mathematics of Chaos - Documentary

                 

The Mathematics of Chaos  -  Documentary



ANAΡΤΗΣΗ ΑΠΟ ΤΟ YOUTUBE 28/3/2017
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Δευτέρα 27 Μαρτίου 2017

BBC James Clerk Maxwell

              



BBC James Clerk Maxwell

Δημοσιεύτηκε στις 29 Οκτ 2016

The Man Who Changed the World

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    ΑΝΑΡΤΗΣΗ ΑΠΟ ΤΟ YOUTUBE 27/3/2017


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Albert Einstein – A Genius Amongst Men

                 



Albert Einstein – A Genius Amongst Men

Δημοσιεύτηκε στις 23 Οκτ 2014

Albert Einstein – A Genius Amongst Men

Einstein
is frequently listed among the greatest scientists of all time, often
together with fellow physicists Galileo and Newton. Does it make sense
to compare them? Galileo is known as the "father of modern physics",
Newton brought the field to a first culmination point through his
Principia Mathematica (the most influential book in the history of
physics, according to Stephen Hawking), and Einstein provided the next
such peak: Nobel laureate Paul Dirac called General Relativity probably
the greatest scientific discovery ever made; Max Born called it the
greatest feat of human thinking about nature.
2000 years from now it
will look as if Galileo / Newton / Einstein lived almost at the same
time, during an outbreak of European scientific creativity spanning a
few centuries. But from the present point of view Einstein's
achievements are still very recent; hence his ideas have had the least
time to unfold their impact. In the beginning of the 20th century he
came up with this great theory explaining the universe, but initially
its impact on daily life was negligible. Since then, however, more and
more extremely practical devices have been developed based on Einstein's
insights, and this trend is continuing, even accelerating. In this
sense, he is continually gaining on Galileo and Newton - it seems a safe
bet that his perceived importance is bound to grow even further.
Recently he already was voted greatest physicist ever (poll for Physics
World magazine; source: BBC News, 29 Nov 1999).

If sheer
popularity was our yardstick (but of course it should not be), the race
would already be over - Einstein is the only truly famous scientist who
ever lived, the only one whose fame matches that of the most popular
rock stars ever. Similarly, his formula E=mc2 appears to be the only
truly famous scientific formula, even though most laymen do not really
understand what exactly it means.

Nevertheless, we should not
forget that it was Archimedes who provided the basic tools that made
possible the discoveries of Galileo, Newton, and Einstein. Since he
started out from much more limited prior knowledge, and since there has
not been much scientific progress for such a long time after his death,
his work appears to be even more unique and outstanding. It seems likely
that for quite some time many will consider Archimedes as the greatest
of them all.

Albert Einstein:
http://en.wikipedia.org/wiki/Albert_E...

Albert Einstein Biography:
http://www.biography.com/people/alber...

Einstein Archives Online:
http://www.alberteinstein.info/

Albert Einstein (German-American physicist)
http://www.britannica.com/EBchecked/t...
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Κυριακή 26 Μαρτίου 2017

The Instability of Astrophysics

                         

The Instability of Astrophysics



Ζωντανή μετάδοση στις 9 Οκτ 2014
Martin Harwit (Cornell University)
ANAΡΤΗΣΗ ΑΠΟ ΤΟ YOUTUBE 27/3/2017




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Public Lecture—In the Shadow of the HIGGS!

               



Public Lecture—In the Shadow of the HIGGS! 

Δημοσιεύτηκε στις 2 Αυγ 2012

Lecture
Date: Tuesday, July 31, 2012. This has been an exciting summer for
particle physicists who have collectively spent the last forty years
hunting for the Higgs boson. Last year, ATLAS and CMS, the two largest
experiments analyzing collisions produced by the Large Hadron Collider,
observed tantalizing hints of this elusive particle. On July 4th, the
two collaborations unveiled their latest data and announced the
independent discovery of a particle. It could be the Higgs, which has
long cast its shadow, but never been seen. Has the Higgs particle
finally been found? Are we just seeing fluctuations of the quantum foam,
or perhaps another particle not yet anticipated? What will we learn
from additional data in the coming years? In this talk Emanuel will
provide context for the amazing interest which these questions have
generated, and where we go from here. Lecturer: Emanuel Strauss, SLAC -
CERN
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The Riddle of AntiMatter

                

The Riddle of AntiMatter

Ανέβηκε στις 19 Αυγ 2011

Explore
one of the deepest mysteries about the origin of our universe.
According to standard theory, the early moments of the universe were
marked by the explosive contact between subatomic particles of opposite
charge. Featuring short interviews with Masaki Hori, Tokyo University
and Jeffrey Hangst, Aarhus University.

Scientists are now
focusing their most powerful technologies on an effort to figure out
exactly what happened. Our understanding of cosmic history hangs on the
question: how did matter as we know it survive? And what happened to its
birth twin, its opposite, a mysterious substance known as antimatter?

A
crew of astronauts is making its way to a launch pad at the Kennedy
Space Center in Florida. Little noticed in the publicity surrounding the
close of this storied program is the cargo bolted into Endeavor's hold.
It's a science instrument that some hope will become one of the most
important scientific contributions of human space flight.

It's a
kind of telescope, though it will not return dazzling images of cosmic
realms long hidden from view, the distant corners of the universe, or
the hidden structure of black holes and exploding stars.

Unlike
the great observatories that were launched aboard the shuttle, it was
not named for a famous astronomer, like Hubble, or the Chandra X-ray
observatory.

The instrument, called the Alpha Magnetic
Spectrometer, or AMS. The promise surrounding this device is that it
will enable scientists to look at the universe in a completely new way.

Most
telescopes are designed to capture photons, so-called neutral particles
reflected or emitted by objects such as stars or galaxies. AMS will
capture something different: exotic particles and atoms that are
endowed with an electrical charge. The instrument is tuned to capture
"cosmic rays" at high energy hurled out by supernova explosions or the
turbulent regions surrounding black holes. And there are high hopes that
it will capture particles of antimatter from a very early time that
remains shrouded in mystery.

The chain of events that gave rise
to the universe is described by what's known as the Standard model. It's
a theory in the scientific sense, in that it combines a body of
observations, experimental evidence, and mathematical models into a
consistent overall picture. But this picture is not necessarily
complete.

The universe began hot. After about a billionth of a
second, it had cooled down enough for fundamental particles to emerge in
pairs of opposite charge, known as quarks and antiquarks. After that
came leptons and antileptons, such as electrons and positrons. These
pairs began annihilating each other.

Most quark pairs were gone
by the time the universe was a second old, with most leptons gone a few
seconds later. When the dust settled, so to speak, a tiny amount of
matter, about one particle in a billion, managed to survive the mass
annihilation.

That tiny amount went on to form the universe we
can know - all the light emitting gas, dust, stars, galaxies, and
planets. To be sure, antimatter does exist in our universe today. The
Fermi Gamma Ray Space Telescope spotted a giant plume of antimatter
extending out from the center of our galaxy, most likely created by the
acceleration of particles around a supermassive black hole.

The
same telescope picked up signs of antimatter created by lightning
strikes in giant thunderstorms in Earth's atmosphere. Scientists have
long known how to create antimatter artificially in physics labs - in
the superhot environments created by crashing atoms together at nearly
the speed of light.

Here is one of the biggest and most enduring
mysteries in science: why do we live in a matter-dominated universe?
What process caused matter to survive and antimatter to all but
disappear? One possibility: that large amounts of antimatter have
survived down the eons alongside matter.

In 1928, a young
physicist, Paul Dirac, wrote equations that predicted the existence of
antimatter. Dirac showed that every type of particle has a twin,
exactly identical but of opposite charge. As Dirac saw it, the electron
and the positron are mirror images of each other. With all the same
properties, they would behave in exactly the same way whether in realms
of matter or antimatter. It became clear, though, that ours is a matter
universe. The Apollo astronauts went to the moon and back, never once
getting annihilated. Solar cosmic rays proved to be matter, not
antimatter.

It stands to reason that when the universe was more
tightly packed, that it would have experienced an "annihilation
catastrophe" that cleared the universe of large chunks of the stuff.
Unless antimatter somehow became separated from its twin at birth and
exists beyond our field of view, scientists are left to wonder: why do
we live in a matter-dominated universe?
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Mathematical Universe - Full Documentary HD

             

Mathematical Universe - Full Documentary HD

Δημοσιεύτηκε στις 26 Μαρ 2017

Mathematical Mystic
The
Role of Mathematics in Science aims to illustrate the many ways in
which mathematical methods have helped discovery in science. It is aimed
at a group of readers who are interested in mathematics beyond the
level of high school. The authors occasionally use some calculus and
more intricate arguments. The book should appeal to college students and
general readers with some background in mathematics. The authors state
that, ``If we succeed in giving an impression of the beauty and power of
mathematical reasoning in science, the purpose of our work will have
been achieved.''
What's the answer to the ultimate question of life,
the universe, and everything? In Douglas Adams' science-fiction spoof
“The Hitchhiker's Guide to the Galaxy”, the answer was found to be 42;
the hardest part turned out to be finding the real question. I find it
very appropriate that Douglas Adams joked about 42, because mathematics
has played a striking role in our growing understanding of our Universe.
The
Higgs Boson was predicted with the same tool as the planet Neptune and
the radio wave: with mathematics. Galileo famously stated that our
Universe is a “grand book” written in the language of mathematics. So
why does our universe seem so mathematical, and what does it mean? In my
new book “Our Mathematical Universe”, I argue that it means that our
universe isn’t just described by math, but that it is math in the sense
that we’re all parts of a giant mathematical object, which in turn is
part of a multiverse so huge that it makes the other multiverses debated
in recent years seem puny in comparison.
The mathematical universe hypothesis
I
was quite fascinated by all these mathematical clues back in grad
school. One Berkeley evening in 1990, while my friend Bill Poirier and I
were sitting around speculating about the ultimate nature of reality, I
suddenly had an idea for what it all meant: that our reality isn't just
described by mathematics – it is mathematics, in a very specific sense.
Not just aspects of it, but all of it, including you.
My starting
assumption, the external reality hypothesis, states that there exists an
external physical reality completely independent of us humans. When we
derive the consequences of a theory, we introduce new concepts and words
for them, such as “protons”, “atoms”, “molecules”, “cells” and “stars”,
because they're convenient. It's important to remember, however, that
it's we humans who create these concepts; in principle, everything could
be calculated without this baggage.
But if we assume that reality
exists independently of humans, then for a description to be complete,
it must also be well-defined according to non-human entities – aliens or
supercomputers, say – that lack any understanding of human concepts.
That brings us to the Mathematical Universe Hypothesis, which states
that our external physical reality is a mathematical structure.
For
example, suppose a basketball trajectory is that of a beautiful
buzzer-beater that wins you the game, and that you later want to
describe what it looked like to a friend. Since the ball is made of
elementary particles (quarks and electrons), you could in principle
describe its motion without making any reference to basketballs:
Particle 1 moves in a parabola.
Particle 2 moves in a parabola.
…
Particle 138,314,159,265,358,979,323,846,264 moves in a parabola.

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Sunspots, Seismicity, Spraying Oh My | S0 News Mar.26.2017

                 

Sunspots, Seismicity, Spraying Oh My | S0 News Mar.26.2017

ΑΝΑΡΤΗΣΗ ΑΠΟ ΤΟ YOUTUBE 27/3/2017
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Σάββατο 25 Μαρτίου 2017

Why is the Quantum so Mysterious ? (Documentary 2017)

           



Why is the Quantum so Mysterious ? (Documentary 2017)



ANAΡΤΗΣΗ ΑΠΟ ΤΟ YOUTUBE 26/3/2017
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8.01x - Lect 23 - Doppler Effect, Binary Stars, Neutron Stars & Black Holes

                   

8.01x - Lect 23 - Doppler Effect, Binary Stars, Neutron Stars & Black Holes



Δημοσιεύτηκε στις 8 Φεβ 2015
Doppler Effect - Binary Stars - Neutron Stars and Black Holes
Lecture Notes, Effects of Inclination of Binary Systems: http://freepdfhosting.com/7d9d78ffe1.pdf
Assignments Lecture 21, 22, 23 and 24: http://freepdfhosting.com/2e96daf94f.pdf
Solutions Lecture 21, 22, 23 and 24: http://freepdfhosting.com/86109d309b.pdf
ANAΡΤΗΣΗ ΑΠΟ ΤΟ YOUTUBE 26/3/2017

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Highly Magnetic Neutron Stars: Bewildering...cosmological tools - Rosalb...

                

Highly Magnetic Neutron Stars: Bewildering...cosmological tools - Rosalb...

ANAΡΤΗΣΗ ΑΠΟ ΤΟ YOUTUBE 26/3/2017




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Neutron stars by Cole Miller

              

Neutron stars by Cole Miller



ANAΡΤΗΣΗ ΑΠΟ ΤΟ YOUTUBE 26/3/2017
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Michio Kaku - Exoplanets - Listener Questions

                



Michio Kaku - Exoplanets - Listener Questions



ANAΡΤΗΣΗ ΑΠΟ ΤΟ YOUTUBE 26/3/2017


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NASA's search for habitable planets and life - Gary H. Blackwood (SETI ...

            



NASA's search for habitable planets and life  - Gary H. Blackwood (SETI ...



Δημοσιεύτηκε στις 24 Μαρ 2017
Dr.
Gary H. Blackwood earned his BS, MS and PHD in Aeronautical and
Astronautical Engineering from MIT. He has been an employee at NASA's
Jet Propulsion Laboratory in Pasadena, CA since 1988 and has worked on
technology development for precision astronomical instruments and
astrophysics missions including the Hubble Wide/Field Planetary
Camera-2, the StarLight formation-flying interferometer, the Space
Interferometry Mission and the Terrestrial Planet Finder. Since 2012 he
has served as the Program Manager for the NASA Exoplanet Exploration
Program, managed by JPL for the Astrophysics Division of the NASA
Science Mission Directorate.
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Stars of an Uncertain Age: The Problem of Determining Stellar Ages

               

Stars of an Uncertain Age: The Problem of Determining Stellar Ages

Δημοσιεύτηκε στις 11 Αυγ 2015

David Soderblom (STScI & Johns Hopkins Center for Astrophysical Sciences)
ANAΡΤΗΣΗ ΑΠΟ ΤΟ YOUTUBE 25/3/2017


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The Short and Complicated Lives of Massive Stars

                 

The Short and Complicated Lives of Massive Stars

Ζωντανή μετάδοση στις 16 Απρ 2015

Selma de Mink (university of Amsterdam)
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Παρασκευή 24 Μαρτίου 2017

Most Complex Quake in Recorded History | S0 News Mar.24.2017

                     



 Most Complex Quake in Recorded History | S0 News Mar.24.2017



ANAΡΤΗΣΗ ΑΠΟ ΤΟ YOUTUBE 24/3/2017


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The Life & Death of Stars (Stellar Parallax 2)

              

The Life & Death of Stars   (Stellar Parallax 2)



Ανέβηκε στις 21 Φεβ 2009
This is part 2 of 2.
ANAΡΤΗΣΗ ΑΠΟ ΤΟ YOUTUBE 24/3/2017






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Q&A: The Hazards of Antimatter Fuel and More...

              

Q&A: The Hazards of Antimatter Fuel and More...

Δημοσιεύτηκε στις 23 Μαρ 2017

In
this week's QA, Fraser answers why antimatter is the perfect fuel
source, and why the evidence of ancient civilizations won't entirely be
hidden by plate tectonics.

Support us at: http://www.patreon.com/universetoday
More stories at: http://www.universetoday.com/
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Primordial Black Holes - Sixty Symbols

                



Primordial Black Holes - Sixty Symbols

Δημοσιεύτηκε στις 21 Μαρ 2017

Primordial Black Holes, featuring Professor Ed Copeland from the University of Nottingham.
More black hole videos: http://bit.ly/Black_Hole_Videos
More Ed Copeland videos: http://bit.ly/CopelandGoesLong

Post
script... Ed points out "the Planck era is usually associated with the
Quantum Gravity scale associated with the beginning of the universe and
is thought to be before the Inflation epoch."

Visit our website at http://www.sixtysymbols.com/
We're on Facebook at http://www.facebook.com/sixtysymbols
And Twitter at http://twitter.com/sixtysymbols
This project features scientists from The University of Nottingham
http://bit.ly/NottsPhysics

Patreon: https://www.patreon.com/sixtysymbols

Sixty Symbols videos by Brady Haran
http://www.bradyharanblog.com

Additional editing and the artwork in this video: Pete McPartlan

Email list: http://eepurl.com/YdjL9
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Neutron Stars & Black Holes Cosmic Parallax 2 VIDEO #2

       

Neutron Stars & Black Holes Cosmic Parallax 2 VIDEO #2

 ANAΡΤΗΣΗ ΑΠΟ ΤΟ YOUTUBE 24/3/2017






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Neutron Stars and Black Holes - VIDEO #1

       



Neutron Stars and Black Holes - VIDEO #1



ΑΝΑΡΤΗΣΗ ΑΠΟ ΤΟ  YOUTUBE 24/3/2017


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Birth of a Black Hole

                    

Birth of a Black Hole



Δημοσιεύτηκε στις 29 Νοε 2012
It
was one of the greatest mysteries in modern science: a series of brief
but extremely bright flashes of ultra-high energy light coming from
somewhere out in space. These gamma ray bursts were first spotted by spy
satellites in the 1960s. It took three decades and a revolution in
high-energy astronomy for scientists to figure out what they were.

Far
out in space, in the center of a seething cosmic maelstrom. Extreme
heat. High velocities. Atoms tear, and space literally buckles. Photons
fly out across the universe, energized to the limits found in nature.
Billions of years later, they enter the detectors of spacecraft
stationed above our atmosphere. Our ability to record them is part of a
new age of high-energy astronomy, and a new age of insights into nature
at its most extreme. What can we learn by witnessing the violent birth
of a black hole?

The outer limits of a black hole, call the event
horizon, is subject to what Albert Einstein called frame dragging, in
which space and time are pulled along on a path that leads into the
black hole. As gas, dust, stars or planets fall into the hole, they form
into a disk that spirals in with the flow of space time, reaching the
speed of light just as it hits the event horizon. The spinning motion of
this so-called "accretion disk" can channel some of the inflowing
matter out into a pair of high-energy beams, or jets.

How a jet
can form was shown in a supercomputer simulation of a short gamma ray
burst. It was based on a 40-millisecond long burst recorded by Swift on
May 9, 2005. It took five minutes for the afterglow to fade, but that
was enough for astronomers to capture crucial details. It had come from a
giant galaxy 2.6 billion light years away, filled with old stars.

Scientists
suspected that this was a case of two dead stars falling into a
catastrophic embrace. Orbiting each other, they moved ever closer,
gradually gaining speed. At the end of the line, they began tearing each
other apart, until they finally merged. NASA scientists simulated the
final 35 thousandths of a second, when a black hole forms.

Chaos
reigns. But the new structure becomes steadily more organized, and a
magnetic field takes on the character of a jet. Within less than a
second after the black hole is born, it launches a jet of particles to a
speed approaching light.

A similar chain of events, in the
death of a large star, is responsible for longer gamma ray bursts. Stars
resist gravity by generating photons that push outward on their
enormous mass. But the weight of a large star's core increases from the
accumulation of heavy elements produced in nuclear fusion. In time, its
outer layers cannot resist the inward pull... and the star collapses.
The crash produces a shock wave that races through the star and
obliterates it.

In the largest of these dying stars, known as
collapsars or hypernovae, a black hole forms in the collapse. Matter
flowing in forms a disk. Charged particles create magnetic fields that
twist off this disk, sending a portion out in high-speed jets.

Simulations
show that the jet is powerful enough to plow its way through the star.
In so doing, it may help trigger the explosion. The birth of a black
hole does not simply light up the universe. It is a crucial event in the
spread of heavy elements that seed the birth of new solar systems and
planets.

But the black hole birth cries that we can now
register with a fleet of high-energy telescopes are part of wider
response to gravity's convulsive power.
ANAΡΤΗΣΗ ΑΠΟ ΤΟ YOUTUBE 24/3/2017




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Neutron Star Formation; Black Hole Formation

                        



Neutron Star Formation; Black Hole Formation

ANAΡΤΗΣΗ ΑΠΟ ΤΟ YOUTUBE 24/3/2017
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