@mikita: That's always possible. It probably goes both ways too.
@mikita: Basically, search and rescue. The ocean's a great place for astronauts to land their spacecraft since it's uninhabited and softer than ground (assuming they'll be using something that doesn't land like an airplane or a hovering flying saucer). The problem is that modern S&R vehicles have a limited range they can travel before it becomes hazardous to the astronauts. That's a huge spacecraft design constraint. But with a vehicle that can go a longer distance more quickly and can hover or land in the water to pick up your crew...
@AngryEddy: hey, hey, whoa. Don't cross the streams.
ahhhh, who gives a rats ass?
@closeencounter: Quantum Leap was the first thing I thought was missing too. Then I thought, that would make this chart unreadable.
@Dunny0: Looks like they went from 1885 to 1995 and that's it. I'm pretty sure that Jennifer wasn't sleeping on her porch for ten years.
didn't BTTF3 start in 1955, go back to 1855, and end in 1985?
@Dr Emilio Lizardo: See there's two sides to every Farce. He got the good side. I got the bad side.
hmmmm, got a source for this one?
Somebody attached a laser sight to their death star.
Maybe Nike will make the McFly's now to compete with the Gremlins.
@praefector:

Yes, whichever vehicle that is next in the rotation is the "Launch On Need" vehicle for the current mission. When they go to the ISS and they find out that they won't be able to return, they'll have a sufficient amount of time (and oxygen) to get the LON vehicle ready and out to the pad. For the Hubble mission, they wouldn't have enough time (oxygen) to get the rescue vehicle ready and launched. It takes time to get a vehicle ready and rolled out. Michael's comment describes this.

@Michael Interbartolo III:
I see you're across the street from me. Thanks for backing me up.
It has nothing to do with space junk. The HST orbit's angle of inclination is a completely different angle from the ISS's orbit. That means that when they launch into the HST's orbit, there's no possible way that they could dock with the ISS. If something goes wrong during the launch, like foam critically damaging the Orbiter's tiles, they'll have no place to go and no way to get home. So they launch a rescue vehicle, but since they have no "safe haven" for the original crew to hang out at like the ISS, the rescue vehicle will need to be on the second pad, ready to go. Time will be of the essence. BTW, the last shuttle mission to NOT go to the ISS...Columbia.
We Come from the Future
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