Astronaut Chris Hadfield has seen the bullet holes left by asteroids on Earth's surface. Our planet is vulnerable. Could we ever survive elsewhere?
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After 665 weightless days in space, NASA's most experienced astronaut, Peggy Whitson, smashes through the atmosphere on her last journey home to planet Earth. With unprecedented filming on board the ISS during Peggy's final mission and with the support of our other featured astronauts, we reveal how their time in space transforms their understanding of our planet's wonders, insights that will change our perspective, too. There is no place like home. Or is there? Just how strange is our rock, and is it really unique in the universe? Astronaut host – Peggy Whitson.
2018 • Astronomy
Today we are talking about the life -- and death -- of stars. Low mass stars live a long time, fusing all their hydrogen into helium over a trillion years. More massive stars like the Sun live shorter lives. They fuse hydrogen into helium, and eventually helium into carbon (and also some oxygen and neon). When this happens they expand, get brighter, and cool off, becoming red giants. They lose most of their mass, exposing their cores, and then cool off over many billions of years.
29 • Crash Course Astronomy • 2015 • Astronomy
How a deadly embrace between science and state altered the fate of the world, and a gripping cautionary tale of mass casualty and unlikely survival.
10/13 • Cosmos: Possible Worlds • 2020 • Astronomy
Using one single, unbroken shot, Journey to the Edge of the Universe explores what we would find if we were able to travel the entire length of our universe.
From the furthest reaches of space to our own cosmic backyard, we count down the discoveries that changed everything we know about our universe.
S5E1 • How the Universe Works • 2016 • Astronomy
If a massive asteroid collides with earth, it could end life on our planet as we know it; new discoveries and cutting-edge tech reveal just how close we are to apocalypse and what it would take for the world's leading space agencies to stop it.
S8E1 • How the Universe Works • 2020 • Astronomy
The Apollo equipment has sat abandoned on the lunar surface for over 40 years. Now there is a renewed excitement and drive to return to the moon. This time, not to just plant a flag, but to colonize. How would we accomplish this? And why would we do it?
2019 • Astronomy