This Week in Photos: #NASATweetup and the Final Launch of the Space Shuttle

"The space shuttle Atlantis is seen shortly after the rotating service structure (RSS) was rolled back at launch pad 39a, Thursday, July 7, 2011 at the NASA Kennedy Space Center in Cape Canaveral, Fla. Atlantis is set to liftoff Friday, July 8, on the final flight of the shuttle program, STS-135, a 12-day mission to the International Space Station. Photo Credit: NASA/Bill Ingalls."


"NASA Twitter followers attending the STS-135 Tweetup are seen through the helmet of a NASA space suit, Thursday, July 7, 2011, at Kennedy Space Center in Cape Canaveral, Fla. About 150 NASA Twitter followers attended the event. The STS-135 mission will be NASA's last space shuttle launch. Photo Credit: NASA/Paul E. Alers."


"Susie Bodman, Twitter handle @sciwhat, tweets during the STS-135 Tweetup, Thursday, July 7, 2011, at Kennedy Space Center in Cape Canaveral, Fla. Photo Credit: NASA/Paul E. Alers."

"Badged. #nasatweetup" Instagram by Jared Smith.

"The NASA Tweetup in front of the Space Shuttle Flickr." Flickr CC photo by Robert Scoble.

"NASA astronaut Mike Massimino, left, and Sesame Street's Elmo speak at the STS-135 Tweetup, Thursday, July 7, 2011, at Kennedy Space Center in Cape Canaveral, Fla. Elmo asked the astronauts questions about living and working in space. Photo Credit: NASA/Paul E. Alers."


"Lar DeSouza, Twitter handle @lartist, a cartoonist, sketches during the STS-135 Tweetup, Thursday, July 7, 2011, at Kennedy Space Center in Cape Canaveral, Fla. Photo Credit: NASA/Paul E. Alers."