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Jason DavisMay 25, 2016

Tomorrow morning, watch a new space module inflate—er, expand

Early tomorrow morning, NASA TV will be showing some very interesting programing.

expandable habitat shipped to the International Space Station last month will slowly fill with air, swelling into a barrel-like room connected to the Tranquility module. BEAM, the Bigelow Expandable Activity Module, is currently less than 2 meters long. But when expanded, it will have a volume of 16 cubic meters—large enough for astronauts to float in and perform periodic systems checks. 

If you live in the U.S., you'll have to get up early to watch. NASA says expansion is scheduled to begin at 6:10 a.m. EDT (11:10 UTC), or even earlier if astronauts and ground controllers are ready. Coverage starts at 5:30 a.m. That's 2:30 a.m. for me here in PDT, so I'll catch the highlights later.

The expansion will take place in daylight, so the resulting visuals should be impressive. NASA said "designers need daylight and video communication to closely monitor the process."

BEAM's location on the ISS


BEAM's location on the ISS

That all sounds pretty cool, but I have a more pressing question: Can I say inflate, or do I have to stick with expand?

I've previously used inflate, but have since noticed NASA and Bigelow exclusively use expand

Merriam-Webster's first definition of inflate, as a transitive verb, is "to swell or distend with air or gas." The key word here is distend. Does the module material stretch like a balloon? Or is BEAM more like a tent, which just gets unpacked? 

To know for sure, we'd have to ask Bigelow, and they haven't exactly been forthcoming on the module's properties. In a previous conference call, Bigelow representative Lisa Kauke wouldn't reveal the composition of the material or even how thick it was, and there is apparently no publicly available data on how well the module can withstand debris strikes.

So we'll have to trust NASA and Bigelow's word choice here and assume the module is more analogous to a tent than a balloon.

Which means we're stuck with expand.

In either case, it should be fun to see. We'll have more coverage tomorrow after it happens.

Read more: All about BEAM, the space station's new inflatable expandable module launching Friday

Read more: International Space Station

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Jason Davis

Digital Editor for The Planetary Society
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