Size Comparison of RX J1856 to
Neutron and Quark Stars
This artist's rendition shows the diameter of RX
J1856.5-3754, determined by data from NASA's Chandra
X-ray Observatory, is too small to be a neutron star.
The data are consistent with predicted size for a
strange quark star, an object never before seen in
nature.
(Illustration: CXC/M.
Weiss)