The Russian Soyuz & Progress are backlit by a phenomenal display of aurora in this April 26 #ISS photo (via @NASA)

@Cmdr_Hadfield in a Russian sim last week w/ Roman Romanenko & @AstroMarshburn. Chris, what’s in Roman’s hand?

Big smiles all around as Chris Hadfield and Ed Robertson pose with the kids of Hawthorne II Bilingual Alternative School in Toronto.

Mission accomplished! Last night #Dextre successfully replaced a failed circuit-breaker box on the #ISS.

Solar Max experiment-creating a magnetic field. #CSA_Edu

Solar Max experiment-creating a magnetic field. #CSA_Edu

Astro_David took this pic while watching landing with thousands of current and former NASA colleagues at JSC's Building 1 in Houston.

Touchdown! Our spokespeople are now doing interviews about this historic milestone.

Atlantis, with Canadarm deployed, undocks from the ISS for the last time - ever. Photo: NASA 07/19/11

#CSATweetup -ers learning about rovers and R&D in the CSA Mars Emulation Terrain.

Tickling astronauts in space... A briefing on the last Cdn science experiment on the Shuttle: Hypersole. #CSATweetup

#CSATweetup -ers in CSA planetary science lab looking at rock samples with Planetary Scientist Richard Leveille.

Some #CSATweetup participants tweeting away! Keep up the good work folks and enjoy every minute of this! #historyinthemaking

Full house at the Canadian Space Agency for the launch of #STS135! GO Atlantis! #CSATweetup

CSA Astronauts Hansen and Saint-Jacques are meeting with #CSATweetup participants and asking a few questions.

CSA Astronauts are signing autographs for employees and their guests. #CSATweetup #pride

#STS135 #CSATweetup attendees - your reserved chairs are waiting for you!

Come check out our rovers in action @festivaleureka http://t.co/sA6KuTp

Cdn astronaut Thirsk was back at NRC yesterday-where his space adventure began in 1983-to return a flown object.

Astro Jeremy Hansen in the Hot Zone @ontsciencectr this a.m.