Satellite in the Sky is the last of the Brit-sci-fi movies I recorded in the marathon last week (the others were ones I've seen or weren't interested in), and it's not very good. The special effects by Wally Veevers are pretty much the main thing going for it, a nice miniature spaceship and launch facility. There are also a couple of nice music cues in the score by Albert Elms, but it's a repetitive score that sometime cuts off abruptly in a scene change, which was rather jarring. (Also, I'm not sure TCM showed it in quite the right aspect ratio; the actors seemed a bit flattened out. But maybe that was a CinemaScope distortion of some sort.)
The story isn't very good, though. The space physics is pretty terrible, which becomes evident right off the bat when they claim in the opening briefing that anything that gets above the stratosphere will be free of gravity. (Why do so many people in film and TV apparently think that gravity is caused by air?) Once in space, there's a token reference to the rockets needing to continue to fire to maintain shipboard gravity, even though the direction of thrust is perpendicular to the direction of weight -- but when the jets are shut off, it makes no difference to the crew's ability to walk around.
Character-wise, it's not much better. Leading lady Lois Maxwell is a strident Luddite, objecting in boringly unsubtle terms to the whole idea of exploration and risk-taking. The other two women in the movie aren't handled much better. The plot is driven by a rather silly secret mission to detonate a super-huge atomic bomb in space in order to demonstrate how pointless it is to detonate super-huge bombs and thereby somehow end war (riiiight, because all the previous ultimate weapons did such a good job ending war). And the military scientist in charge of the bomb is a by-the-numbers obstructionist/coward villain type, up until his inevitable self-sacrifice in the very abrupt and anticlimactic climax.
Also, the title was misleading. It wasn't a satellite in the sky, it was a rocketship in space. I demand a refund!
(By the way, I forgot to mention one thing that struck me as interesting about The Tunnel -- which, again, was a British film made in 1935. In one scene, the characters were talking about an earlier undersea tunnel from Miami to Havana, or someplace in the Caribbean, and they pronounced "Miami" like "Mee-yah-mee." Which I suppose is the Spanish pronunciation, but I can't recall having heard it before. Maybe the English used it because they hadn't heard how the pronunication had been localized in the US?)