We have the strongest evidence yet for a moon orbiting a planet outside of our solar system. This moon — if it exists — would be about the size of Neptune, which makes it kind of an oddball. But if there's one thing we've learned about the nearly 4,000 exoplanets we've found outside of our solar system so far, it's that there's a lot of variation out there. So why not expect some strange exomoons in the bunch?
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Playing with Light
Why So Big?
Written by Elizabeth Howell October 3, 2018
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