There’s a reason why a rocket has to go so fast to escape Earth. It’s about gravity – something all of us experience every moment of every day. Gravity is the force that pulls you toward the ground.

Elon Musk's private rocket company SpaceX announced Monday that it plans to launch two paying customers around the moon in late 2018. How hard will that be to accomplish, exactly? Gravity makes it ...

Editor’s note: Welcome to Just4Kids, a new feature with content from The Conversation for Kids, a nonprofit in which scholars answer kids’ questions about science, health and more, that will be ...