NASA’s Chandra X-ray Observatory and the Hubble Space Telescope
We may have just seen solid evidence for thousands of planets outside the Milky Way. It would be the first glimpse of planets outside our galaxy.
These traces were found with the help of gravitational lensing, which happens when an object magnifies the light of something more distant, making it appear larger to telescopes. The quasar RX J1131‑1231, a galactic nucleus surrounded by a ring of gas and dust, has a well observed rotation rate thanks to this effect. But the …