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This Greek philosopher believed we could not possibly be the only life forms in a universe so vast.
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This Chinese philosopher found it implausible there weren't other earths and other heavens.
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This Italian monk was burned at the stake for his heliocentric theory, which was based on Nicolaus Copernicus' original model.
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This Italian scientist stuck with the heliocentric model at the risk of his own livelihood. He made many important discoveries about the solar system.
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Fermi's question of "Where are they?" still shapes the debate of projects searching for intelligent life in the universe.
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The astronomer developed a a formula to calculate the the potential number of radio-transmitting civilizations in our galaxy. He also started Project Ozma, a systematic attempt of encountering alien radio signals.
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Scientists form the SETI Institute to spearhead the search for alien lifeforms.
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Gibson claimed he and his team of NASA scientists found evidence of life inside a Martian meteorite, igniting one of the most famous scientific controversies in recent history.
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Australian astronomers claim to have found an object heavier than Earth using a new method, gravitational lensing. The object was maybe an extrasolar planet.
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The European probe was sent to Titan, a moon of Saturn, to search for signs of life in it's atmosphere.
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NASA launched the planet hunter to reveal Earth-like planets orbiting suns elsewhere in the universe.
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Based on recent discoveries made by the Kepler Spacecraft, Stofan claimed alien life would be discovered within 30 years.
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This was the closest analogue to Earth discovered so far, with 386 day years and potentially similar surface temperatures.
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Seven planets with temperate Earth-like temperatures and of similar size have recently been found around the dwarf-star Trappist-1. These planets have been rumored to possess rocky surfaces and maybe even atmospheres.