Originally posted by Nailer
When they had the space shuttle up there why didnt they just pick it up or repair it.
It's not as simple as just driving your shuttle over to the satellite and picking it up. When the shuttle rendezvous with the ISS, for example, that
is all carefully planned from before launch. They have to get on the same basic orbital path, the same inclination and altitude, then they make small
adjustments to catch up to it in that orbit. It takes a lot of gas to significantly change the orbit of the shuttle, so they don't just crank it up
and fly it around. It's all planned well in advance and it's just too risky to change the inclination, drop it down a hundred miles or so, and pick
up a satellite on such short notice.
Of course they did know about this quite awhile in advance (the satellite failed shortly after launch in 2006 and they knew it was going to be coming
down eventually), but as important as the risk of a hydrazine leak somewhere on earth sounds, it's not so critical that they would totally scrub a
shuttle mission by altering it to pick up the satellite on the way back down. After all, there's a 2/3 chance that even if they did nothing, the
satellite would fall harmlessly in an ocean. It's hardly worth disrupting NASA's already ailing ISS/Shuttle schedule.