The mysterious Kepler-1625b-i and its parent planet may once have been siblings
Deep Space
Deep Space
Astronomy
What if our Moon had its own moon?
Astronomers have explored the physical and orbital constraints of “submoons” around other moons
Deep Space
Have astronomers finally found a moon outside our Solar System?
Astronomers believe they have discovered a Neptune-sized satellite orbiting a giant Jupiter around a Sun-like star