NASA's Hubble Space Telescope maps gas halo surround Andromeda galaxy

NASA's Hubble Space Telescope maps the giant halo of gas enveloping our nearest galactic neighbour the Andromeda galaxy for the first time

Astronomers looked at the light from background quasars to study the halo. They found the halo stretches out 1.3 million light years towards the Milky Way. The halo includes heavy elements ejected by stars exploding in a supernova.

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