A new study from NASA's Jet Propulsion Laboratory and Oxford University shows how ocean currents can affect how fast or slow Europa's icy crust rotates.
A March 22 study suggests that 'Oumuamua, which passed us in 2017, was a comet from another solar system. Harvard astronomer Avi Loeb strongly disagrees.
If you see a foreboding, green sky, it's best to take cover. A tornado might not be approaching, but green skies can be a sign of hail and other bad weather.