Science, Solar System How do astronomers determine the Sun’s sibling stars and where the Sun originated?
Cosmology, Exotic Objects In the first gravitational wave detection, black holes with masses of 29 and 36 Suns created a 62-solar-mass black hole. Three Solar masses were lost; how do black holes lose mass?
Cosmology, Galaxies Will the Pinwheel Galaxy (M33) merge with the Andromeda Galaxy (M31) prior to Andromeda merging with the Milky Way?
Science Are any of the planets’ average distances from the Sun changing? Is Neptune moving away to fit Bode’s law?
Science Artists always show a black hole’s accretion disk oriented in one plane. But stars near Sagittarius A* orbit in a variety of planes. If each of those stars is eventually digested, wouldn’t there be multiple accretion disks in multiple planes?