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Name: James A. Murray
Status: N/A
Age: N/A
Location: N/A
Country: N/A
Date: Around 1999


Question:
What is the principle behind the "gravity assist" that they used to get the Galileo probe to Jupiter? It seems that one would lose all the energy one gained falling by climbing away from the gravity source. Or is the net energy gained by the probe only taken from the planet's momentum (and therefore no energy is gained by using the sun)?



Replies:
You have the idea exactly. It works only if the body you're using is moving in the general direction you want to go.

Mooney



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