A scene from “Unfinished Business”

There are many kinds of stars. Some are bright like the Sun. Some are dim. The greatest stars are ten million times larger than the smallest ones. Some stars are old beyond imagining, more than ten billion years of age. Others are being born right now. When atoms fuse in the hearts of stars, they make starlight. Stars are born in litters, formed from the gas and dust of interstellar clouds.