Short animated film that introduces a movie

I watched this animated movie a few years ago about two shooting stars (or something like that) that found each other in outer space, they fall in love and have a baby. Then a kind of black hole persues them until it kills the father, the mother manages to escape and save their son, but she eventually dies after saving him. I think this short film its a introduction to a movie but i cant remeber properly. I have a vague memmory that it was called “The last star/shooting star” but surely it was another name.