On Tue, 23 Jul 2002, The Silent Observer wrote:
> Well, there have been a number of Mars missions recently, any of which
> might have discarded a third stage in the right vector space for that
> kind of orbit...
Unfortunately, they've generally been launched on Deltas. That means a
very small liquid second stage, which *probably* doesn't leave Earth orbit
(I don't remember the numbers for sure, though), and an even smaller solid
third stage.
To be mistaken for a rock, it's really got to be at least a Centaur, and
preferably an S-IVB.
> There was also NEAR and that recent comet mission.
Deltas, both of them.
Henry Spencer
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