HD 40307 g Coloring Page
April 1, 2020
| Credit | NASA-JPL/Caltech |
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Twice as big (in volume) as Earth, HD 40307 g straddles the line between "Super-Earth" and "mini-Neptune," meaning scientists aren't sure if it has a rocky surface or one buried beneath thick layers of gas and ice. One thing is certain though: at eight times Earth's mass, its gravitational pull is much, much stronger. Color this world! Do you picture a rocky planet or one shrouded in gas and ice?