As NASA's James Webb Space Telescope makes its way out to its intended orbit, ground teams monitor its vitals using a comprehensive set of sensors located throughout the entire spacecraft. Mechanical, thermal, and electrical sensors provide a wide array of critical information on the current state and performance of Webb while it is in space.

A system of surveillance cameras to watch deployments was considered for inclusion in Webb's toolkit of diagnostics and was studied in-depth during Webb's design phase, but ultimately, this was rejected.

"Adding cameras to watch an unprecedently complicated deployment of such a precious spacecraft as Webb sounds like a no-brainer, but in Webb's case, there's much more to it than meets the eye," said Paul Geithner, deputy project manager—technical for the Webb telescope at NASA's Goddard Space Flight Center. "It's not as straightforward as adding a doorbell cam or even a rocket cam."

First of all, Webb is big, undergoes many configuration changes during deployment, and has many specific locations of import to deployment.

At about 8:48 a.m. EST, a specialized radiator assembly necessary for Webb's science instruments to reach their required low and stable operating temperatures deployed successfully. The Aft Deployable Instrument Radiator, or ADIR, is a large, rectangular, 4- by 8-foot panel, consisting of high-purity aluminum subpanels covered in painted honeycomb cells to create an ultra-black surface. The ADIR, which swings away from the backside of the telescope like a trap door on hinges, is connected to the instruments via flexible straps made of high-purity aluminum foil. The radiator draws heat out of the instruments and dumps it overboard to the extreme cold background of deep space.

The deployment of the ADIR—a process that released a lock to allow the panel to spring into position—took about 15 minutes.

Webb's final series of major deployments is planned to start tomorrow, Jan. 7, with the rotation into position of the first of two primary mirror wings. The second primary mirror wing—Webb's final major spacecraft deployment—is planned for Saturday, Jan. 8.

"Space now," was what Japanese billionaire Yusaku Maezawa wanted to tweet for years. He finally really did it, from the International Space Station.

"The space market holds so much potential," he said Friday at the Foreign Correspondents' Club in Tokyo, his first news conference in Japan after returning to earth before Christmas.

Maezawa, who heads a company called Start Today, is preparing to invest in various businesses which may develop from the ongoing research by NASA, the Japanese equivalent called JAXA and others.