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What's 'Out There?' Space.com's Mike Wall Dishes on the Search for Aliens
November 15, 2018 | ArticleWhy haven't we heard from aliens? Scientists don't know, but they have a couple of ideas.
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How Life Could Help Atmospheric Tides Slow a Planet's Rotation
November 13, 2018 | ArticleResonating oscillations of a planet's atmosphere caused by gravitational tides and heating from its star could prevent a planet's rotation from steadily slowing over time, according to new research.
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Colonizing Mars Means Contaminating Mars — And Never Knowing For Sure If It Had Its Own Native Life
November 12, 2018 | ArticleBefore that happens, we need to recognize that a very real possibility exists that the first human steps on the Martian surface will lead to a collision between terrestrial life and biota native to Mars.
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Billionaire Yuri Milner's Breakthrough Initiatives Eyes Private Mission to Seek Alien Life
November 09, 2018 | ArticleBreakthrough Initiatives, which already scans the heavens for possible signals from faraway alien civilizations, is considering looking for E.T. closer to home — in our own solar system.
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Where Are All the Aliens? 'Out There' Book Excerpt
November 09, 2018 | ArticleIn 'Out There' (Grand Central Publishing, 2018), Space.com senior writer Mike Wall tackles the search for alien life from many different angles and discusses humanity's drive to get off its natal rock. Read an excerpt from the new book here.
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Was Life on the Early Earth Purple?
November 09, 2018 | ArticleA purple-pigmented molecule could have been the first to turn sunlight into metabolic energy.
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Wild Idea: What If Interstellar Visitor 'Oumuamua Is an Alien Light Sail?
November 06, 2018 | ArticleThe odd interstellar object that zoomed through the inner solar system last October might be an alien reconnaissance spacecraft, a new study suggests.
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Could Life Hitch a Ride on Interstellar Visitors Like 'Oumuamua?
November 06, 2018 | ArticleThe first known interstellar visitor to the solar system, 'Oumuamua, highlights how life could also spread between the stars, and perhaps even across the galaxy, two new studies find.
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For Close-Knit Planets, Sharing Life Could Be Easy
November 04, 2018 | ArticleLife-forms could jump from one planet to another in tight-knit planetary systems, scientists say.
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Scientists Home in on the Best 'Water Worlds' to Search for Alien Life
October 25, 2018 | ArticleAs far as we know, all life requires one thing, water, and that's why scientists are fascinated by worlds they know or suspect host giant oceans: These worlds are among the best candidates for finding life beyond Earth.
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