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NOVA
Could Mars Have a Ring Around It One Day?
Phobos, one of Mars' moons, has an uncertain origin, but its surface grooves show that tidal forces are pulling it apart. In time, Mars' gravity will shatter it entirely, creating a ring of debris around the planet.
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As state-legalized cannabis spreads, NOVA explores its little-known risks and benefits.
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NASA launches its most ambitious search yet for traces of ancient life on Mars.
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Discover the fascinating chemistry that makes our world and everything in it—including us.
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Discover the fascinating chemistry that makes our world and everything in it—including us.
53:31
Discover the fascinating chemistry that makes our world and everything in it—including us.
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Can bringing predators—and fear—back into an ecosystem help restore its natural balance?
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Paleontologist Kirk Johnson explores the dynamic history—and future—of ice at the poles.
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Discover the science behind Leonardo da Vinci's masterpieces—and Mona Lisa's iconic smile.
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Amazing fossils reveal how mammals took over after an asteroid wiped out the dinosaurs.