The tweet in question comes courtesy of NASA's Mike Massimino, a.k.a Astro_Mike, whose status update reads, "From orbit: Launch was awesome!! I am feeling great, working hard, & enjoying the magnificent views, the adventure of a lifetime has begun!"
Astro_Mike is part of a seven person crew that left Cape Canaveral on a final maintenance mission to keep the Hubble Space Telescope in service until 2014. With the blessing of NASA, Massimino's tweets will serve to enlighten his 234,240 followers and add a layer of transparency that we've yet to behold.
Sure, we had to expect that Twitter savvy NASA would eventually use their 140 characters to take us outside the confines of Earth, but now that there's a Twitter space mission in progress, we're anxious to follow along and see what Astro_Mike tweets next. Who knows, maybe we'll even get a Twitpic or two?