Astronomers say they have found evidence for the first time of a planet orbiting a star outside our Milky Way galaxy.The evidence was observed by a telescope operated by the American space agency NASA.It is called the Chandra X-ray Observatory.NASA says the orbiting observatory is the world’s most powerful X-ray telescope.NASA recently announced that the observatory might have discovered a new planet in the galaxy known as Messier 51 or M51.The galaxy is popularly known as the “Whirlpool” galaxy.The research recently appeared in the publication Nature Astronomy.The possible planet is considered an exoplanet.These are planets that orbit a star outside of our own solar system.NASA says that so far, more than 4,500 exoplanets have been discovered and are considered "confirmed."
