Largest rocky world found
At half Neptune’s size, exoplanet should be gassy — but it’s not
![rocky planet](https://i0.wp.com/www.sciencenews.org/wp-content/uploads/2016/02/020216_cc_rocky-planet_free.jpg?fit=860%2C460&ssl=1)
SOLID AS A ROCK A planet about half the size of Neptune might be made of pure rock, making it larger than other known rocky planets (one illustrated).
JPL-Caltech/NASA