There’s something about comparing the size of objects—say, moons or sci-fi starships—that is endlessly appealing. But while comparisons we’ve seen cover subsets of stuffs, none have looked at the big ...
This story was updated at 1:55 p.m. EST. The Milky Way hosts at least 17 billion Earth-size alien planets, and probably many more, a new study reveals. Astronomers have determined that about 17 ...
Astronomers have made the best-ever measurement to date of the radius of an alien world. Using observations by NASA's Kepler and Spitzer space telescopes, researchers determined that the exoplanet ...
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