Season 2
15 episodes · premiered Mar 20, 2018
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E1 Earth: The Secret History
Astronaut Mike Massimino uses the latest science to reveal the strange secrets of planet earth, and explores whether alien earths exist elsewhere in the universe.
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E2 Alien Planets: Cosmic Nightmares
Astronaut Mike Massismino uncovers the violent secrets of the most deadly planets outside our solar system.
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E3 Milky Way: The Monster Inside
Astronaut Mike Massimino explores the dark secret of the Milky Way, the home to both Earth and a terrifying supermassive black hole.
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E4 Ends of the Solar System: Strange Frontiers
Astronaut Mike Massimino uses the latest NASA discoveries to explore the dark and mysterious frontiers of our solar system.
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E5 Ice Giants: The Frozen Aliens
Astronaut Mike Massimino journeys to Uranus and Neptune, the farthest planets from the sun and the home to some of the solar system's strangest mysteries.
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E6 Alien Galaxies: The Strange Secrets
Astronaut Mike Massimino explores the universe's strangest alien galaxies, strange places that could be home to extraterrestrial life and deadly supermassive black holes.
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E7 Mercury: The Cursed Planet
Astronaut Mike Massimino explores Mercury, a deadly and tiny planet that faces constant attacks from the Sun, and which might one day pose a threat to all life on Earth.
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E8 Comets: Mysteries from the Deep
Astronaut Mike Massimino reveals the alien secrets of comets, strange visitors from deep space that might be responsible for life on Earth.
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E9 The Sun: Secrets of Our Star
Astronaut Mike Massimino journeys to the sun, revealing the secrets of Earth's star and how it will one day destroy the planet.
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E10 The Solar System: Alien Origins
Astronaut Mike Massimino uncovers the strange and violent birth of the solar system, and reveals how its planets were built from the wreckage of bygone alien worlds.
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E11 Dwarf Planets: Aliens Among Us
Astronaut Mike Massimino explores dwarf planets, mysterious worlds like Pluto that are too small to be a planet, but are home to some of the universe's biggest secrets.
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E12 Alien Stars: Mystery of the Monsters
Astronaut Mike Massimino journeys to the deadliest stars in the universe, where terrifying suns can rip apart planets but may be integral to life on Earth.
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E13 Alien Volcanoes: Life in Hell
Astronaut Mike Massimino uses the latest science to explore the alien volcanoes of distant worlds and reveals if they are hotbeds for extraterrestrial life.
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E14 Alien Moons: The Next Earth
Astronaut Mike Massimino journeys to the alien moons of the solar system and discovers if these strange worlds could be habitable for life beyond Earth.
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E15 Alien Oceans: Search for Life
Astronaut Mike Massimino explores the mysterious oceans of the solar system, where the latest discoveries provide new clues in the search for alien life.