The wave of star birth will continue to migrate farther out in the nebula, he said, until in a few million years it will be a shell of glowing gas with its most massive stars at its periphery.

CNN: Stellar nursery in nearby galaxy teems with activity

Not only is Tyson feisty and funny and glowing with inner light, but her co-stars prove more than compelling: Vanessa Williams is politely savage as her preening daughter-in-law, icy without becoming a dragon.

WSJ: Review: Tyson sublime in 'The Trip to Bountiful'