James Webb Space Telescope’s mirrors are cooling to deep space temperature

NASA’s massive new space telescope just keeps getting colder.

While the James Webb Space Telescope‘s slow cooling process is nearing its end, NASA officials wrote in an update, there’s no firm timeline on when all the observatory components will meet their operating temperatures. That’s because much of this stage of the telescope’s months-long commissioning period comes down to physics, as mission managers wait for the mirrors to naturally cool to a temperature to allow alignment to continue.

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