It doesn’t make sense…
Apparently exoplanet is BAFFLING astronomers for this reason. This thing is as big as Neptune and it is made of pure rock. Almost always when a planet reaches this size, or at least those observed by astronomers it involves some or all parts gas. Here is a bit more about this find:
BD+20594b sits about 500 light-years away in the constellation Aries. The planet is about 16 times as massive as Earth but just a little over twice as wide, making its density about 8 grams per cubic centimeter, Néstor Espinoza, an astrophysicist at the Pontifical Catholic University of Chile in Santiago, and colleagues report. Earth’s density, by comparison, is 5.5 grams per cubic centimeter.
The fact that it takes 42 days to orbit around its star may make a bit more sense here but it is still surprising to the team who spotted it.
Let’s check out a cool video on other mysterious exoplanets on page 2