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PBS Space Time

Dark Forest: Should We Not Contact Aliens?

Season 10 Episode 3 | 14m 12s

In 1974 we sent the Arecibo radio message towards Messier 13. The message was mostly symbolic; we weren’t really expecting a reply. Yet surely other civilisations out there are doing the same thing. So, why haven’t we heard anything? What if the silence from the stars is a hint that we shouldn’t be so outgoing? What if aliens are deliberately keeping quiet for fear that they might be destroyed?

Aired: 03/13/24
Extras
Watch • 14:50
PBS Space Time
Why Didn’t Antimatter Destroy The Universe?
Why is there any matter in the universe? A new antimatter breakthrough at LHC holds clues.
Episode: S11 E2 | 14:50
Watch • 16:30
PBS Space Time
New Evidence: Earth Had Rings (and Might Regain Them)
There’s an extremely good chance that Earth once did have a ring system.
Episode: S11 E1 | 16:30
Watch • 17:23
PBS Space Time
How Astrophysics Can Literally Save the World
How is it possible to tell if a space rock will one day collide with the Earth?
Episode: S10 E37 | 17:23
Watch • 15:58
PBS Space Time
Your DNA's Codes Are (Probably) From Outer Space
Did you know that many of us have up to 4% neanderthal DNA?
Episode: S10 E36 | 15:58
Watch • 16:35
PBS Space Time
Will The Big Bang Happen Again (and Again)?
What if the Big Bang was just an endless cycle?
Episode: S10 E35 | 16:35
Watch • 19:39
PBS Space Time
The Final Barrier to (Nearly) Infinite Energy
Why are billions suddenly being pumped into fusion startups?
Episode: S10 E34 | 19:39
Watch • 16:36
PBS Space Time
The Crisis in Physics: Why the Higgs Boson Should Not Exist!
The universe should've collapsed after the Big Bang, but a light Higgs boson let us exist.
Episode: S10 E33 | 16:36
Watch • 14:30
PBS Space Time
Does Timescapes Disprove Dark Energy?
Maybe dark energy doesn't exist?
Episode: S10 E32 | 14:30
Watch • 18:32
PBS Space Time
How Many Black Holes Are In The Solar System?
Dark matter has eluded us for many decades but we may be able to discover more now.
Episode: S10 E31 | 18:32
Watch • 15:35
PBS Space Time
Does Infinity - Infinity = an Electron
What do you get if you combine something that’s infinitely massive and negative infinitely massive?
Episode: S10 E30 | 15:35
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Watch • 14:50
PBS Space Time
Why Didn’t Antimatter Destroy The Universe?
Why is there any matter in the universe? A new antimatter breakthrough at LHC holds clues.
Episode: S11 E2 | 14:50
Watch • 16:30
PBS Space Time
New Evidence: Earth Had Rings (and Might Regain Them)
There’s an extremely good chance that Earth once did have a ring system.
Episode: S11 E1 | 16:30
Watch • 17:23
PBS Space Time
How Astrophysics Can Literally Save the World
How is it possible to tell if a space rock will one day collide with the Earth?
Episode: S10 E37 | 17:23
Watch • 15:58
PBS Space Time
Your DNA's Codes Are (Probably) From Outer Space
Did you know that many of us have up to 4% neanderthal DNA?
Episode: S10 E36 | 15:58
Watch • 16:35
PBS Space Time
Will The Big Bang Happen Again (and Again)?
What if the Big Bang was just an endless cycle?
Episode: S10 E35 | 16:35
Watch • 19:39
PBS Space Time
The Final Barrier to (Nearly) Infinite Energy
Why are billions suddenly being pumped into fusion startups?
Episode: S10 E34 | 19:39
Watch • 16:36
PBS Space Time
The Crisis in Physics: Why the Higgs Boson Should Not Exist!
The universe should've collapsed after the Big Bang, but a light Higgs boson let us exist.
Episode: S10 E33 | 16:36
Watch • 14:30
PBS Space Time
Does Timescapes Disprove Dark Energy?
Maybe dark energy doesn't exist?
Episode: S10 E32 | 14:30
Watch • 18:32
PBS Space Time
How Many Black Holes Are In The Solar System?
Dark matter has eluded us for many decades but we may be able to discover more now.
Episode: S10 E31 | 18:32
Watch • 15:35
PBS Space Time
Does Infinity - Infinity = an Electron
What do you get if you combine something that’s infinitely massive and negative infinitely massive?
Episode: S10 E30 | 15:35