NASA Television was the "certified" public channel, available in the channel store for a while now. The developer is listed as CMG (don't know who that is). It showed the two NASA streams with no commercial breaks. It now just splashes information on InstantTVChannel.com, which is a channel developer toolkit site.
Joe Screwdriver's NASA Channel WAS a private, "non-certified" channel that one could find at places like StreamFreeTV. Heck, I installed it just recently, as a private channel, as a backup to the public channel. It has commercials.
Strangely, it just showed up in the channel store; thus is now public and "certified." It is listed as version 1.0, version date is listed as January 4, 2018, and the developer is listed as InstantTVChannel. It is all so confusing. With that said, at least I have a stream to watch, albeit with commercials.
Of course, I know that NASA has been available on Pluto TV; but I like having NASA available in my home grid, without the need to go from a grid, to another grid, to watch. And I have found Pluto TV to be wonky at times. Of course, Youtube has the two streams as well.
"One great use of words is to hide our thoughts." Voltaire
"We are masters of the unsaid words, but slaves of those we let slip out." Winston Churchill