Also, at the end of Jupiter Jazz pt.2, we see a shooting star which symbolizes Gren's death on his way back to Titan. The old native man says:
"That is no ordinary star, that is the tear of a warrior. One who has finished his battle somewhere on this planet..."
that is from the sub, but the dub basically says the same thing as well.
And in The Real Fold Blues pt.2 at the ending credits, it pans up to the sky and we see one of the stars slowly dim and then go out.
In The Real Folk Blues pt.2, Jet goes to visit the same old native man, and he asks him where Spike is. The old man tells him:
"all beings with life, all have their own stars. The moment a new life is born, a new star is born, and becomes the guardian star. This star we stand on is someone's guardian star as well. That red star, that blue star.
When a life ends, that star falls and dissapears.
You running rock,
His star is about to fall, I have dreamed it."