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 ...

(This is an expanded version of an earlier post, taking into account escape velocity as well as surface gravity.) Earth-sized exoplanets have been very much in the news lately. In early November ...

Returning to its starting point after a two-year billion-mile loop out beyond the orbit of Mars, NASA's Juno probe raced toward Earth Wednesday for a velocity-boosting flyby, using the planet's ...

Terminal velocity is the maximum speed gravity can pull an object toward Earth. Escape velocity is the speed necessary to break out of Earth’s gravitational pull. Which of these is most important ...

Curious Kids is a series for children of all ages. If you have a question you’d like an expert to answer, send it to ...

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.