Monday, February 9, 2015

Researchers construct 3-D map of Cassiopeia A

11,000 light-years away but only 340 years ago as seen on Earth, a massive star exploded in a supernova. This incredible explosion has left a set of rings of gas and dust, together forming a continuously expanding sphere centered on the original object, the remnant of which has collapsed into a neutron star. The shell of debris is now about twelve light-years across. But lest you imagine a hollow ball, note that hot there’s gas and debris throughout that entire spherical region. This...-> read more

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