The Cosmic Conspiracy of Dark Energy Challenge Question | Space Time | PBS Digital Studios
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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=xZTb6sfHEX8 Part 2 - Why the Universe Needs Dark Energy https://www.youtube.com/watch?v=-4PayaEgEZc Part 3 - What Does Dark Energy Really Do? https://www.youtube.com/watch?v=RUE_LUqcTvM 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 Support us on Patreon! http://www.patreon.com/pbsspacetime Help translate our videos! http://www.youtube.com/timedtext_cs_panel?tab=2&c=UC7_gcs09iThXybpVgjHZ_7g 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)
Comments
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the cosmic conspiracy of dank energy
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Couldnt dark energy be just radiation from stars and galaxies? The foton does not have mass, but could it be other types of radiation? I mean the volume of interstellar and intergallactic space compared to stars and planets is way bigger and if its filled with something could add up to something huge...can someone tell me whats wrong with this thingking?
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I'm not smart enough to do these challenge questiins.
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Trust the force ... dont go to the dark side !
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If dark energy increases along with the expansion of space, could this be due to an outside influence pressing against our universe from the outside? like an oil drum that has had its air taken out but is under pressure from the atmosphere. the bigger the drum the more potential energy released if you collapse the barrel.
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Nice Star Trek Computer sound effects on that pie chart, I see what you did there ;)
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If Dark Matter and Dark Energy coexist as WIMPs with our normal Matter, then it could definitely exist Dark Matter life and entire civilizations that we are not aware of! And they would probably cannot "see us either"...
Or... we might possible be as well an experiment from Dark Matter aliens that created this space we call 'universe' without the possibility to detect them... but who knows... :) (hahaha) -
I absolutely love the sound effects used in these videos. Non-distracting and also interesting at the same time.
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I have a questions about dark energy:
If dark energy doesn't exhibit currently measurable effects, how is it that it influences the spacing and arrangement of galaxies? -
has the solution video for this been released yet? i am quite anxious to know :)
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2:37 in the bottom equation I see a/a. Isn't that 1?
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i feel like a retard when i see this! but its very fascinating!!:D
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This is the coolest channel ever.
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If dark energy increases as the universe expands and gains energy joule for joule wouldn't that break the second law of thermodynamics?
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If a galaxy, or a star, was being expanded towards us at faster than the speed of light (AKA dark energy, or space expanding), would we be able to see it? (hoping I'm not mixing my terms while in a haze).
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Totally off topic but, Dark Energy became a significant factor about the time life arose on Earth, eh? Hmm. If you were running simulations to study naturally arising sentient tool users you'd need lots of computational Petri dishes, galaxies. Once life spontaneously starts in one it's calculation overhead skyrockets, you'd need to limit extraneous information to give maximum computer time to the life you're studying. Like when an MMO gets too many users and the servers need to be split. If we think in terms of spacial atoms (as perceived from inside the sim), limiting the number of direct paths to other server clusters, lower bandwidth, would feel like distance inside the simulation.
Ahh, conspiracy theories, the hobgoblin of idle net surfers. -
So if we (the universe) continue to accelerate in an expansion (speed); Then as we get closer to the speed of light, won't time slow down. Therefor, won't there be an infinite expansion of the universe?
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if large masses and black holes distort the space fabric to a crazy extent then why doe the friedman equation make it 3d and flat?
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More distant galaxies move away from us "faster" because we are seeing back in time when the universe was expanding faster.
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Imagine our universe exists inside a trash bag and we can only view the contents. But the visible contents do not measure up to the mass required for the universe to work. And blackholes are actually holes in the sides of the bag. So my idea for dark matter is that dents in the bag caused by things outside the bag...say a hobo sitting on a trash bag in an alley--his posterior causes a massive dent in the bag which is something inferrable from inside the bag but not actually detectable. I wish I had a more technical way to describe this, but is this weird idea a possible explanation for dark matter, that some forces or matter from outside our universe are making impressions to the shell of our universe?
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