Why did NASA’s James Webb Space Telescope have to endure ~100 days inside a freezing cold cryogenic vacuum chamber that could reach temperatures of -440°F/-262°C? To ensure it can function when it launches more than a million miles from Earth next year. Get the frigidly cold details: https://nasa.tumblr.com/post/166574134169/why-webb-needs-to-chill[fb_vid id=”10155925340176772″]