If you brought an empty vacuum sealed jar from outer space into earths atmosphere; would it implode

the jar was emptied of all molecular contents in space, vacuum sealed and returned to earths atmosphere. would the atmospheric pressure cause the jar to implode?

Daha .... YES................

Probably not. That's like taking a jar 10 metres down in the ocean - not very far for a SCUBA diver or submarine, and most people can surface dive that far. So go try it.
More exciting to blow up a balloon at 20 metres underwater, then let it go.

That depends, if the jar was reinforced glass, or some other form of super-strong material, then it wouldnt.
however a regular glass jar probably would implode, as the glass is super fragile in comparison :)

It would pretty much get squeezed, yes. Here's an example: http://en.wikipedia.org/wiki/File:Plasti… (remember to read the title/caption).

Unless the glass were particularly flimsy, it would not implode. Light bulbs for many years were manufactured from glass with a vacuum inside, and they did not implode unless broken.