If you follow NASA on Twitter and ever wondered what it would be like to fly the space shuttle, your two worlds just came together.

More on space: Gigantic changes keep space technology hot
The Johnson Space Center is hosting a daylong Tweet-up on July 19, during space shuttle Atlantis' STS-135 mission to the International Space Station. Participants will get a behind-the-scenes tour at Johnson and a hands-on opportunity aboard the shuttle simulator to take control in a training scenario, NASA said.
Atlantis is slated to launch on July 8. If it launches as planned, the Tweet-up will take place one day before the last orbiter of the shuttle fleet makes its final landing.
Tweet-up registration opens at 11 a.m. today and closes 24 hours later on Wednesday, June 29. NSA will pick the Twitter users on the 29th.
Follow Michael Cooney on Twitter: nwwlayer8
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