Does anyone remember this movie? I recall that it had lots of Space:1999 type hardware, and the commander of the starship was played by 1999's
Nick Tate (Captain Alan Carter, of "Eagle One" fame). The film was about the relativistic effects of near-c interstellar flight, and did pretty well, even to the effects of viewing a supernova at point-blank range. At the end, rather than contesting the gravitational attraction of a black hole and being torn apart, they dive into the event horizon and do a wormhole bit, coming out in a strange new universe.
For a fifteen year old in the mid seventies this was heady stuff--relativity,
sort-of plausible astronomy, AND a total lack of aliens, humanoid or otherwise. These people were going out there to EXPLORE, and considering the content of most SF these days, that is pretty refreshing.