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Δευτέρα 2 Νοεμβρίου 2015

The Birth of Planets

         





The Birth of Planets





Δημοσιεύτηκε στις 11 Σεπ 2015
The
Birth of Planets Around the Sun and Other Stars. With thousands of
planets now known around other stars, it's natural to wonder why so many
planetary systems are quite different from our own. Some stars have
several planets inside the location of Mercury's orbit, where our Solar
system is basically empty. Other stars have planets more massive than
our Jupiter, on looping, eccentric orbits. A few stars have "hot
Jupiters" circling every few days on orbits so tight the starlight heats
the planets' atmospheres beyond the point where iron vaporizes. Many
stars have planets intermediate in size between our rocky Earth and icy
Uranus -- sizes that are completely missing from the Solar system. Some
planets orbit not one, but two stars, as part of binary star systems. So
where did all this diversity come from? We know planets must form from
the gas and dust orbiting young stars. We see the orbiting material with
the Hubble and Spitzer Space Telescopes and telescopes on the ground,
but the dust makes the material opaque at optical and infrared
wavelengths, so it's hard to know what's going on inside. In recent
years our view has become clear enough to make out some features that
might be caused by young planets orbiting within the material. I will
discuss several of the new images, and a few of the 3-D computer models
astronomers are using to try to learn how planets are born into such
diversity.

Speaker:
Dr. Neal Turner

Related Media

The von Kármán Lecture Series:
https://www.youtube.com/playlist?list...

Release Date: September 10, 2015

Credit: NASA Jet Propulsion Laboratory (JPL), California Institute of Technology
ANAΡΤΗΣΗ ΑΠΟ ΤΟ YOUTUBE 2/11/2015

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