A supernova erupted recently1 in galaxy M82, a mere 11.4 million light years away from Earth, which means that it was close enough to be discovered by someone using an ordinary telescope in London and may be visible with binoculars sometime in the next two weeks.
M82’s proximity means that there are many existing images of it, pre-explosion, including some from the Hubble Space Telescope. Cao and others will comb through those images, looking for what lay in the region before. It will not be easy: M82 is filled with dust. But the light the supernova shines on the dust could teach astronomers something about the host galaxy, too. One team is already looking for radioactive elements, such as nickel, that theories predict form in such supernova, says Shri Kulkarni, an astronomer at California Institute of Technology. “Dust has its own charms.”
Ok, it didn’t erupt recently. M82 is 11.4 million light years away, so the supernova happened 11.4 million years ago and the light is just now reaching us here on Earth.↩