Rogue planets — worlds that drift through space alone without a star — largely remain a mystery to scientists. Now, astronomers have for the first time confirmed the existence of one of these starless worlds by pinpointing its distance and mass — a rogue planet roughly the size of Saturn nearly 10,000 light-years from Earth.
Planets are typically found bound to one or more stars. However, in 2000, astronomers detected the first signs of a "rogue planet" — a free-floating world that orbited no star. Then, in 2024, researchers detected an object distorting the light from a distant star, simultaneously from both Earth and space using several ground-based observatories as well as the European Space Agency's now-retired Gaia space telescope. These observations helped scientists estimate that the object was a newfound world found about 9,950 light-years from Earth in the direction of the Milky Way's center, with a mass about 70 times larger than Earth. (Saturn, on the other hand, is about 95 Earth masses.)
