Astronomers using the National Science Foundation's Green Bank Telescope (GBT) have discovered a unique stellar system of two white dwarf stars and a superdense neutron star, all packed within a space smaller than Earth's orbit around the Sun.
Most stars do not form alone, but with many siblings that are created at about the same time from a single cloud of gas and dust. NGC 3572, in the southern constellation of Carina (The Keel), is one of these clusters.
Blazars can best be described as the brightest of active galactic nuclei, with many emitting very high-energy gamma rays.
NASA's Hubble space telescope has captured an image of HH 151, a bright jet of glowing material trailed by an intricate, orange-hued plume of gas and dust.