how fast does a rocket need to be traveling in MPH to leave Earth's orbit
If you want to completely escape Earth's gravity and travel to another moon or planet, though, you need to be going even faster-at a speed of at least 7 miles per second or about 25,000 miles per hour. 1  Javascript must be enabled to use Cool Cosmos.2  Learn how.f you want to completely escape Earth's gravity and travel to another moon or planet, though, you need to be going even faster-at a speed of at least 7 miles per second or about 25,000 miles per hour. 1  Javascript must be enabled to use Cool Cosmos. 2  Learn how.