First evidence found of planet outside galaxy

Photo by: NASA
Photo by: NASA

(Houston, TX) -- Could there really be a planet in another galaxy? Astronomers believe that's what they found using a NASA telescope.  

It's about the size of Saturn and 28-million light years away from the Milky Way. It's either orbiting a black hole or the collapsed core of a giant star. Researchers say more data is needed to know for sure.  

Astronomers have already spotted four planets beyond the solar system but still within the Milky Way.