This does totally sound like the 1975/1976 TV film The Day After Tomorrow. Quoting from Wikipedia's plot summary:
In the future, the survival of human civilisation is increasingly threatened by rising pollution, environmental damage and the depletion of the Earth's natural resources. The narrator (Ed Bishop) introduces Space Station Delta and the "lightship" Altares – the latter of which is the first Earth spacecraft to "harness the limitless power of the photon", allowing it to travel at the speed of light. Altares is due to leave Delta on a mission beyond the Solar System to seek out Earth-like planets for possible colonisation.
However, disaster strikes when Altares is caught in the gravity of a black hole that has formed from a collapsed star. The photon drive is unable to provide the faster-than-light speeds necessary to break free; nevertheless, Anna urges the crew not to give up hope, for she suspects that the object may be a gateway to another universe. Her theory is proven correct when, sustaining the various space-time distortions at the event horizon, Altares safely emerges from the black hole – intact, albeit with no way of returning to Earth. As the vessel and its intrepid crew approach a planet, the narrator concludes, "One thing is sure – this is not the final word. Not the end, but the beginning. A new universe, a new hope? Only time will tell."
I remember when they exited the black hole, the stars were very large and bright crosses, right?