From StarTalk.
What happens to gravity when matter converts to energy? Neil deGrasse Tyson and co-host Paul Mecurio dive into fan questions about the speed of light, time machine mistakes, and what Neil would do if he were an alien.
Could a time machine land you in empty space because the solar system wasn’t “there” yet? If Neil were an alien meeting a human for the first time, what would he ask about? Will there one day be more black holes in the universe than stars? And how exactly does gravity behave when energy is released during fusion?
Do we understand the speed of light? We discuss how precise our measurement of the speed of light is. We get into how negative gravity would make a wormhole. We explore how your eyes might see color differently if you evolved under a blue star, why visible light is only a sliver of the electromagnetic spectrum, and how the cosmic microwave background acts as a kind of universal clock.
Why do metal boats float? Neil explains buoyancy and why heavy things can still float. When matter is lost to energy during fusion, what happens to the gravity? Is our solar system made of many supernovae? Plus, what is on the other side of the speed of light?
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Timestamps:
00:00 – Introduction: Grab Bag
01:56 – Time Machines Are Also Space Machines
06:53 – If You Were an Alien, What Would You Ask Humans?
12:30 – Will There Be More Black Holes Than Stars One Day?
16:31 – The Cosmological Constant
21:37 – Wormholes & Gravity
27:22 – What If We Orbited a Blue Star?
32:06 – Is the Cosmic Microwave Background a Universal Clock?
34:19 – Opposite of the Speed of Light
39:14 – Bouyancy
42:31 – What Happens to Gravity in Mass-Energy Conversion?
44:38 – How Many Supernovae Are We Made of?
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Science meets pop culture on StarTalk! Astrophysicist & Hayden Planetarium director Neil deGrasse Tyson, his comic co-hosts, guest celebrities & scientists discuss astronomy, physics, and everything else about life in the universe. Keep Looking Up!
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