How did they discover a planet outside of the Galaxy?

Name: How did they discover a planet outside of the Galaxy?
Uploaded: 2018-02-16T20:00:33+02:00
Duration: 1 min 3 s
Description: For the first time ever a planet was discovered outside of the milky way. But how did they manage to look so far into space?

46 16.02.2018

For the first time ever a planet was discovered outside of the milky way. But how did they manage to look so far into space?