Carl Sagan talks about religion and the universe
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Our species has discovered a way to communicate through the dark, to transcend immense distances
1989 • Astronomy
"You might have thought, as I did then, that our species would be on Mars before the century was over"
1989 • Astronomy
Carl Sagan talks about our future and the exploration of space
1989 • Astronomy
"That's home. That's us. On it, everyone you ever heard of, every human being who ever lived.."
1990 • Astronomy
Supernovas are the violent death of giant stars, and new discoveries reveal that these cataclysmic events create the elements that are essential to all life in the universe.
S7E2 • How the Universe Works • 2019 • Astronomy
When a strange alien object is discovered speeding through our solar system, experts race to uncover if it's real evidence of extraterrestrial contact or a deadly asteroid on a collision course with planet earth.
Space's Deepest Secrets • 2018 • Astronomy
New discoveries reveal an astonishing supermassive black hole that was born during the earliest days of the cosmos, and finding out how this giant grew so large so quickly may help to explain the very formation of the universe itself.
S9E9 • How the Universe Works • 2021 • Astronomy
The incredible secrets of the moon are revealed; the moon might be responsible for life on Earth.
S4E6 • How the Universe Works • 2015 • Astronomy
Scientists are only now starting to unravel the secrets of comets. Often referred to as dirty snowballs, they contain ice and elements from the very start of the universe. Some theorize that a comet, crashing into our planet, brought with it the organic material that started life on Earth. Spacecraft continues to offer new information on their makeup, from bringing back samples from a comet's tail to direct contact when a NASA-launched craft slammed into the comet Tempel-1.
Planet Science • 2007 • Astronomy
The shape, contents and future of the universe are all intricately related. We know that it's mostly flat; we know that it's made up of baryonic matter (like stars and planets), but mostly dark matter and dark energy; and we know that it's expanding constantly, so that all stars will eventually burn out into a cold nothingness. Renée Hlozek expands on the beauty of this dark ending.