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Goodbye, Galileo



 
 
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  #11  
Old September 22nd 03, 07:37 PM
Jonathan Silverlight
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Default Goodbye, Galileo

In message , Pat Flannery
writes


Michael R. Grabois ... change $ to \"s\" wrote:


"All these worlds are yours except Europa. Attempt no landings there."


Giant floating Jovian "Windbag" creatu "The pizza's here! But watch
it, the damn thing's hot!


Brilliant, as always.
I hope someone writes a serious (or not) short story on this theme, like
"A Song for Skyfall" that came out after SL-9.
We are dropping things on these hypothetical aliens they've never seen
before - refined metals, shaped parts, isotopes. We are doing what the
aliens did for us in "2001".
--
"Forty millions of miles it was from us, more than forty millions of miles of
void"
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  #12  
Old September 22nd 03, 09:46 PM
Henry Spencer
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Default Goodbye, Galileo

In article ,
Jonathan Silverlight wrote:
The umbrella-antenna technology has a long history of successful use, e.g.
on TDRS. The Galileo HGA disaster was (probably) a mistake in the details
of how the technology was applied, not an indication that the technology
is fundamentally flawed. (And had Galileo been launched using
Shuttle-Centaur as originally planned, the antenna would have been
opened before separation from the shuttle...)


How does that work? The antenna wasn't exactly strong, though it was
presumably stronger than the motor :-( What sort of jolt does it get
when the engine fires?


Not very much on a Centaur, which does not have terribly high
acceleration. The fully deployed antenna is reasonably strong, and
it is so light that the acceleration does not induce large forces.

And just to add another question (sorry everyone) wasn't there some
concern that the same type of antenna was used in other satellites (TDRS
??)


There was indeed, but since it invariably worked fine on TDRS, the
conclusion was that the problem was *probably* something unique to
Galileo. The prime suspect is redistribution of lubricant due to
vibration from all the traveling Galileo did while awaiting launch,
but nobody can be really sure.
--
MOST launched 1015 EDT 30 June, separated 1046, | Henry Spencer
first ground-station pass 1651, all nominal! |
 




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