## What is escape velocity?

Escape velocity is the rate that an item needs to be travel to break free of a world or moon"s gravity well and leave that without more propulsion. For example, a spacecraft leaving the surface of earth needs to it is in going 7 miles per second, or nearly 25,000 miles per hour to leave without falling earlier to the surface or falling right into orbit.

A Delta II rocket blasting off. A huge amount of power is needed to accomplish escape velocity. Photograph from Jet Propulsion Laboratory"s Planetary goals & Instruments photo gallery http://www-b.jpl.nasa.gov/pictures/browse/pmi.html

Since escape velocity counts on the fixed of the earth or moon that a spacecraft is blasting off of, a spacecraft leaving the moon"s surface might go slower than one blasting turn off of the Earth, because the moon has actually less gravity 보다 the Earth. ~ above the various other hand, the escape velocity because that Jupiter would certainly be many times the of Earth"s due to the fact that Jupiter is so huge and has so much gravity.

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 Body Escape Velocity in Kilometers/ Second Escape Velocity in Miles/Hour Ceres (largest asteroid in the asteroid belt)

One factor that manned goals to other planets are complicated to setup is the a delivery would need to take sufficient fuel into an are to blast off of the various other planet once the astronauts wanted to walk home. The weight of the fuel would make the spaceship so hefty it would be hard to blast it off of Earth!

What is gravity? just how do we placed a spacecraft into orbit? as soon as a delivery is in orbit, execute we need to do noþeles to save it there? exactly how did DS1 gain into space? can NASA use ion propulsion to placed a ship right into space?

What is mass? Why is that a an excellent idea come launch a ship right into orbit from close to the equator? Why is mass important? exactly how does a multi-stage rocket choose the Delta II work? Why walk it take it so much energy to launch DS1?