In an incredible world first, astrophysicists detected multiple planets in another galaxy earlier this year, ranging from masses as small as the Moon to ones as great as Jupiter. Given how difficult it is to find exoplanets even within our Milky Way galaxy, this is no mean feat. Researchers at the University of Oklahoma achieved this in February thanks to clever use of gravitational microlensing . The technique, first predicted by Einstein's theory of general relativity, has been used to find exoplanets within Milky Way, and it's the only known way of finding the smallest and most distant planets, thousands of light-years from Earth. As a planet orbits a star, the gravitational field of the system can bend the light of a distant star behind it. We know what this looks like when it's just two stars, so when a planet enters the mix, it creates a further disturbance in the light that reaches us - a recognisable signature for the planet. So far, 53 exopl
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