Neutron star seen forming exotic new state of matter - space - 04 February 2011 - New Scientist

Neutron star seen forming exotic new state of matter: It has long been assumed that neutrons in the cores of neutron stars become superfluid, but without any direct evidence that they do so. That changed in 2010, when astrophysicists Craig Heinke and Wynn Ho examined measurements taken by NASA's orbiting Chandra X-ray Observatory of the 330-year-old neutron star at the heart of the dusty supernova remnant Cassiopeia A...

These measurements show the star has dimmed by 20 per cent since it was discovered in 1999, corresponding to an estimated temperature drop of 4 per cent. "It's enormously fast cooling," says Dany Page of the National Autonomous University of Mexico in Mexico City.