Dean Whitbread 2020
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The 12.4 mile-wide object has been cloaked in mystery since it was identified as a powerful X-ray source in 1999.
Astronomers now know the source is a neutron star 11,000 light years from Earth at the centre of the supernova Cassiopeia A.
It is the youngest object of its kind ever discovered, having appeared just 330 years ago.
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