Scientists have long thought the moon's volcanos stopped erupting a billion years ago. But dotting the lunar landscape are some remarkably fresh volcanic features.
Is SDSS1133 a supermassive black hole ejected from its home galaxy, or the remains of a massive star that exploded as a supernova? Astronomers aren't sure.
Japanese astronomers probing deeply back into our universe's early history have found 7 galaxies at a time when the universe was only 700 million years old.
The black holes are central to quasars in the early universe. Researchers say the probability that their aligned spin is the result of chance is less than 1%.