You want to build a spaceship that can travel from Earth to the newly established colony on Mars, but there's no way a human crew can survive the trip.
It was a great moment in the history of NASA, especially since people had been working so long at trying to get a probe to Mars
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?
When astronauts orbit the earth, they’re still subject to gravity, but they’re moving sideways so quickly that even though they’re being pulled towards the earth, they’re not getting any closer to the center of the planet.