Neutron stars are some of the densest objects in the Universe. The material inside gets squeezed so hard that scientists don’t yet know what form it takes. The core of a neutron star might be made of a thick soup of quarks, or contain exotic particles that couldn’t survive anywhere else in the Universe. Credit: ICE-CSIC/D. Futselaar/Marino et al., edited’s Chandra have revealed three unusually cold, young neutron stars, challenging current models by showing they cool much faster than expected.
In a neutron star , the quarks that comprise the neutrons are confined inside the neutrons. In a quark star , the quarks are free, so they take up less space and the diameter of the star is smaller. Credit: NASA/CXC/M.Weiss Neutron stars are the compressed cores of giant stars, left behind after the star exploded in a supernova. They are so dense that a sugar cube’s amount of neutron star material would weigh as much as all the people on Earth! Credit: ESAThe three oddball neutron stars being so cold makes them too dim for most X-ray observatories to see.
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