Everything about Rx J1856 5-3754 totally explained
RX J1856.5-3754 (also called
RX J185635-3754,
RX J185635-375, and various other designations)
is a nearby
neutron star. It is believed to have been created by a
supernova explosion of its
companion star about one million years ago and is moving 108
km/s across the sky. It was discovered in 1992, and observations in 1996 appeared to confirm that it was a
neutron star, the closest neutron star to
Earth yet discovered. It was originally thought to be about 150–200
light-years away, but further observations using the
Chandra X-ray Observatory in 2002 appear to show that its distance is greater—about 450 light-years. It was once proposed that RX J1856.5-3754 was too small to be a neutron star and may therefore in fact be a
quark star (see also
3C58). However, this theory isn't currently considered to have much supporting evidence.
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