NASA’s Chandra X-ray Observatory announced that astronomers could have found evidence for a possible planet outside of the Milky Way galaxy. The ‘exoplanet’ – M51 of the ‘Whilpool’ galaxy would be much farther away than any of the other found in the Milky Way.
...Has NASA discovered the first exoplanet outside Milky Way?
The planet was identified by detection of temporary dimming X-rays in a binary system, the observatory reported.