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From Discover: “Everything Worth Knowing About … Alien Contact” Almost » A size comparison of the planets of the TRAPPIST-1 system, lined up in order of increasing distance from their host star. The planetary surfaces are portrayed with an artist’s impression of their potential surface features, including water, ice, and atmospheres. Credit: NASA.
richardmitnick 2:31 pm on September 3, 2017 | Full size is 700 × 350 pixels Reply
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