Any aliens building around Tabby's star would have to be thinking very big.
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Jill Tarter helped propel the hunt for extraterrestrial intelligence. Her biographer talks about how she became the driving force in the field.
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Aliens may have something in common with life on Earth.
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Earth's early crust may have been sluggish when life formed.
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Maybe intelligent life is widespread throughout the galaxy, but most of it lives in deep, dark subsurface oceans that are cut off from the rest of the cosmos.
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The search for extraterrestrials has gone on long before the SETI Institute was founded in 1984.
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Could the building blocks for life on Earth have been delivered by meteorites crashing into ponds of water 4 billion years ago?
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Chemicals that eventually formed the very first organisms on Earth may have relied on a liquid solvent other than water.
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Organic molecules once thought to be produced only by life-forms have been found in two separate regions of space.
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Mars' Gale Crater, once home to a flowing river and a lake, had the right conditions for life in ancient times, according to a new study looking at three years of data from NASA's Curiosity rover.
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