Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer. These limits are being tested by the discovery of a lone neutron star in space. Astronomers are able to directly infer the star's size from measurements of its unblended brightness, temperature, and an upper limit on the distance. Assuming that the object is a neutron star of typical mass, some previous theories of neutron star structure would have predicted an implosion that would have created a black hole . That this neutron star even exists therefore allows a window to the extreme conditions that exist in the interiors of neutron stars.
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