Stars Sirius, our brightest star, is orbited by a white dwarf — a dead star’s core. Where is the planetary nebula that would have formed when it shed its skin?
Exoplanets, Planets At tens, hundreds, or thousands of light-years from a star, how do you distinguish between exoplanets, sunspots, and dwarf binary companions?
Exoplanets, Planets, Solar System On the martian surface, would the moons Deimos and Phobos be visible to the unaided eye?
Exoplanets, Planets, Robotic Spaceflight, Solar System Live coverage: New Horizons’ historic Pluto flyby
