Liquid Helium could have been colder and thereby reducing the quantity needed for the test.
How much liquid nitrogen did it take to freeze @NASAWebb for a little more than 90 days? Here are a couple of ways to measure it. (Liquid nitrogen wasn't the only thing we used; read more about how we kept #Webb cool here: https://go.nasa.gov/2vmzRCv ) #JWSTpic.twitter.com/sEIDefMjXM
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We also used gaseous helium. You can read more about what and why in the story:https://www.nasa.gov/feature/goddard/2017/how-does-nasa-s-webb-telescope-stay-cool-in-chamber-a …
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