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From: gwh@typhoon.Berkeley.EDU (George William Herbert)
Newsgroups: sci.space.shuttle
Subject: Re: Galileo Gravity Boost
Message-ID: <1989Oct19.221857.18273@agate.berkeley.edu>
Date: 19 Oct 89 22:18:57 GMT
Sender: usenet@agate.berkeley.edu (USENET Administrator;;;;ZU44)
Reply-To: gwh@typhoon.Berkeley.EDU (George William Herbert)
Organization: ucb
Lines: 16

In article <12027@eerie.acsu.Buffalo.EDU> stein-c@autarch.acsu.buffalo.edu (Craig Steinberger) writes:
>Can anyone explain how Galileo will be gaining energy by flying near
>planets? I understand that the spacecraft will be gaining velocity due
>to gravity forces as it approaches Venus, etc., but wouldn't all of that
>energy be lost as Galileo goes away from the planet and has to go
>against gravity forces? The only way I can see it is if Galileo picks up
>some of the energy from the velocity of the planet. 

	That's the idea.  It's a momentum transfer... Planet slows down by
some mniscule amount, spacecraft speeds up a LOT.


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George William Herbert  UCB Naval Architecture Dpt. (my god, even on schedule!)
maniac@garnet.berkeley.edu  gwh@ocf.berkeley.edu
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