Cold comets — both natives and the interstellar Comet Borisov — have nickel and iron vapor in their atmospheres, and scientists want to know why.
A thick inner layer of slowly falling helium blobs might help explain Saturn's almost perfectly aligned magnetic field.
"Flakes" coming off the Great Red Spot have had some wondering if this epic storm is coming to an end. But observations and computer modeling show it's only getting stronger.
A new study estimates the number of interstellar objects that fly through the inner solar system every year, and it could be quite a lot.
NASA's Osiris-REX mission has found evidence of ancient water flows on the surface of asteroid Bennu.