The sun may be far away, but its solar flares still present a deadly risk for astronauts going to the moon.
What is the difference between an asteroid and a comet?
Mount Everest is five-and-a-half miles high. Pretty impressive, unless you live on Mars. Learn more on this Moment of Science.
Ever wondered what makes up Saturn's rings? Find out on this Moment of Science.
Have astronomers found a new planet? Or is an asteroid in our midst?