Supernova 'echoes' are a window to the galaxy's past

Supernova 'echoes' are a window to the galaxy's past


By Ivan Semeniuk It’s a case of cosmic déjà vu. Four hundred years ago, Danish astronomer Tycho Brahe launched his career with an account of a dazzling stellar explosion as bright as the planet Venus. It later turned out to be a supernova in the Milky Way. Now a team of astronomers has watched the same explosion, long after the dying star fizzled out, by measuring “light echoes” – light from the original explosion that has reflected off interstellar dust and headed in our direction. They also saw faint reflected flashes from Cassiopeia A,
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