Experience the Gravity of a Super-Earth
![HD 40307 g, a super earth exoplanet is on a poster featuring a skin diver without a parachute.](https://science.nasa.gov/wp-content/uploads/2023/09/HD_39x27_1200_preview.jpg?w=4096&format=jpeg)
March 23, 2016
Credit | NASA/JPL-Caltech |
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Twice as big in volume as the Earth, HD 40307 g straddles the line between "Super-Earth" and "mini-Neptune" and scientists aren't sure if it has a rocky surface or one that's buried beneath thick layers of gas and ice. One thing is certain though: at eight times the Earth's mass, its gravitational pull is much, much stronger.