The Cosmic Conspiracy of Dark Energy Challenge Question | Space Time | P...
Δημοσιεύτηκε στις 11 Μαΐ 2016
We're
living in the middle of a remarkable cosmic coincidence, an incredibly
brief period of time where both matter and dark energy both play a part
in the fate of our universe. To better understand this video watch our
other Dark Energy episodes:
Part 1 - Will the Universe Expand Forever https://www.youtube.com/watch?v=xZTb6...
Part 2 - Why the Universe Needs Dark Energy https://www.youtube.com/watch?v=-4Pay...
Part 3 - What Does Dark Energy Really Do? https://www.youtube.com/watch?v=RUE_L...
Get your own Space Time tshirt at http://bit.ly/1QlzoBi
Tweet at us! @pbsspacetime
Facebook: facebook.com/pbsspacetime
Email us! pbsspacetime [at] gmail [dot] com
Comment on Reddit: http://www.reddit.com/r/pbsspacetime
In
the past few episodes we have delved deep into cosmology. We have been
building up the tools we need to understand dark energy and its
influence on the universe. In this episode we will discuss the balance
between dark energy and matter. If you add up the energy in any large
volume of space, about 70% is dark energy and the remaining 30 % is
“regular” matter. However the universe has been dark for a relatively
short period. At some point in the past there was a perfect balance
between energy and matter. Dark Energy has dominated the universe only
during the tenure of life on Earth, although it’s effect has been felt
for longer than that.
Here’s your Challenge question: For How
many of those 100 past doublings has dark energy had any significant
effect? Let’s say at least 10% of the energy density. And how for many
of those infinite future doublings will regular matter and energy have a
significant effect – again, at least 10% of the energy density?
Extra
Credit: Also tell me how many billion years ago dark energy started to
have a significant effect, and how many billion years in the future
matter will cease to … matter?
Prizes: 3 Correct Answers for the
“simple” question and 3 Correct Answers for the extra credit parts will
receive Space Time t-shirts. To be eligible please explain your
reasoning and show your working. Feel free to propose any solutions you
come up with for the apparent cosmological coincidence. Do NOT give
answers in the comment section – that’ll disqualify you for this and
future challenge questions. Email your answers to pbsspacetime@gmail.com
with the subject line Dark Energy Challenge within two weeks. We will
filter by subject line, so make sure sure you use exactly this phrase to
be considered.
Written and hosted by Matt O’Dowd
Made by Kornhaber Brown (www.kornhaberbrown.com)
living in the middle of a remarkable cosmic coincidence, an incredibly
brief period of time where both matter and dark energy both play a part
in the fate of our universe. To better understand this video watch our
other Dark Energy episodes:
Part 1 - Will the Universe Expand Forever https://www.youtube.com/watch?v=xZTb6...
Part 2 - Why the Universe Needs Dark Energy https://www.youtube.com/watch?v=-4Pay...
Part 3 - What Does Dark Energy Really Do? https://www.youtube.com/watch?v=RUE_L...
Get your own Space Time tshirt at http://bit.ly/1QlzoBi
Tweet at us! @pbsspacetime
Facebook: facebook.com/pbsspacetime
Email us! pbsspacetime [at] gmail [dot] com
Comment on Reddit: http://www.reddit.com/r/pbsspacetime
In
the past few episodes we have delved deep into cosmology. We have been
building up the tools we need to understand dark energy and its
influence on the universe. In this episode we will discuss the balance
between dark energy and matter. If you add up the energy in any large
volume of space, about 70% is dark energy and the remaining 30 % is
“regular” matter. However the universe has been dark for a relatively
short period. At some point in the past there was a perfect balance
between energy and matter. Dark Energy has dominated the universe only
during the tenure of life on Earth, although it’s effect has been felt
for longer than that.
Here’s your Challenge question: For How
many of those 100 past doublings has dark energy had any significant
effect? Let’s say at least 10% of the energy density. And how for many
of those infinite future doublings will regular matter and energy have a
significant effect – again, at least 10% of the energy density?
Extra
Credit: Also tell me how many billion years ago dark energy started to
have a significant effect, and how many billion years in the future
matter will cease to … matter?
Prizes: 3 Correct Answers for the
“simple” question and 3 Correct Answers for the extra credit parts will
receive Space Time t-shirts. To be eligible please explain your
reasoning and show your working. Feel free to propose any solutions you
come up with for the apparent cosmological coincidence. Do NOT give
answers in the comment section – that’ll disqualify you for this and
future challenge questions. Email your answers to pbsspacetime@gmail.com
with the subject line Dark Energy Challenge within two weeks. We will
filter by subject line, so make sure sure you use exactly this phrase to
be considered.
Written and hosted by Matt O’Dowd
Made by Kornhaber Brown (www.kornhaberbrown.com)
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