Scientists believe that a technique called gravitational microlensing has let them spot a super-Earth planet in an Earth-like orbit around a small, faint star. One thing is certain though: at eight times the Earth's mass, its gravitational pull is much, much stronger. Its mass is 4 Earths, it takes 12.5 days to complete one orbit of its star, and is 0.103 AU from its star. A whole new category of planets, Super Earths are quite common in our galaxy. HD 164922 d is a super Earth exoplanet that orbits a G-type star. 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. Super Earth—Super Girth Over the last 20 years, we have discovered all kinds of strange planets we never thought could exist and that have no analog in our solar system. A super-Earth is a planet that is close to Earth's size and mass, but not so big that its surface is surrounded by a gas envelope — like a small version of Uranus.

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