What determines a star’s color? Its temperature. Red stars are cool, with surface temperatures of around 3,000 kelvins (K), while blue stars are hotter and
The neutron star (illustration) at the center of the remains of the Cassiopeia A supernova may have a core filled with a strange frictionless fluid,
Six planet orbit Kepler-11, a sunlike star 2,000 constellation Cygnus distant in the constellation Cygnus. Those are teh second batch of data of the planet-hunting Kepler
Orion, often referred to as The Hunter, in front radio telescope.
Star trails create arches over the horizon in a long-exposure picture of the night sky taken from Mount Kilimanjaro in Tanzania.
The three bright stars in Orion’s belt stand in a nearly vertical line above the snow covered road at the bottom. Photographer Brendan Alexander
Captured above Japan earlier this month, a picturesque night sky was photographed behind a picturesque frosted leaf. The reflecting ice crystals on the leaf coolly