Planets Around Stars in Other Galaxies

Scientists have recently used this to find planets passing in front of black holes in other galaxies. They looked out with a Chandra X-ray telescope at a galaxy called the Whirlpool Galaxy and they saw this kind of eclipse. The theory is that it might be a planet orbiting a black hole with a period of about 70 years, which means we wouldn't know for another 70 years because we'd have to wait that long to see the next eclipse if it is in fact orbiting that black hole.