A new study shows that Uranus and Neptune are different shades of blue due to a layer of excessive haze on Uranus. This makes its atmosphere look lighter.
As a planetary defense exercise, scientists used a recent approach of Apophis as a test to see how quickly they could track and identify a hazardous asteroid.
An astronomer explains how homeless aliens might hitch a ride on rogue planets, to travel through interstellar space and colonize new planetary systems.