Why does a rocket have to go 25,000 mph (about 40,000 kilometers per hour) to escape Earth? – Bo H., age 10, Durham, New Hampshire There’s a reason why a rocket has to go so fast to escape Earth.

The milestone came five days after the Blue Ghost completed a maneuver, the trans lunar injection, meant to allow it to escape Earth's gravitational pull and send it on a short transit to the moon ...

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 ...