A Field Guide to Alien Planets

Exo-Earths

Although the vast majority of the exoplanets found have been gas or ice giants, terrestrial exoplanets most likely outnumber these behemoths, and upcoming missions may soon finally discover rocky worlds the size of Earth with atmospheric conditions that mimic our own. To harbor life, these “Goldilocks planets” would have to orbit their star at just the right distance from to not roast or freeze as well as be large enough to retain an atmosphere, but not so large as to become a gas giant.

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B. Hot Jupiter


Ragnar Larsen