To determine whether we're alone in the universe, astrobiologists look to Jupiter, Mars, and, closer to home, extreme environments on Earth.
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Quantum theory, the best explanation of how atoms and anything smaller behave, is so weird even scientists who have mastered it find it baffling. But bit by bit scientists are finding maybe it's not so weird as comparable behavior is discovered in our every day world. It's just that no one noticed before.
S2E07 • Through the Wormhole • Astronomy
Artificial selection is one example, eyes another, of the well-documented and inescapable process of evolution--change in a population of species over time--by natural selection. These are some of the things that molecules do.
S1E2 • Cosmos: A Spacetime Odyssey • 2014 • Astronomy
Life once existed on Mars, but a series of devastating mass extinctions have made present-day life nearly impossible. The latest science shows how Martian life keeps bouncing back as it transforms from a watery world like Earth into a desert planet.
S5E7 • How the Universe Works • 2017 • Astronomy
Ants, scorpions and fireflies provide clues for biologists to conjecture about life on exoplanet Janus, including highly adaptable pentapods.
S1E2 • Alien Worlds • 2020 • Astronomy
Carl Sagan talks about our future and the exploration of space
7/10 • The Sagan Series • 1989 • Astronomy
Phil starts the planet-by-planet tour of the solar system right here at home, Earth.
11 • Crash Course Astronomy • Astronomy