How do we know the age of stars? On this episode, Neil deGrasse Tyson and comic co-host Paul Mecurio answer fan questions about stars, black hole collisions, the speed of light, and the present crisis in cosmology.

NOTE: StarTalk+ Patrons can watch or listen to this entire episode commercial-free here: https://www.startalkradio.net/show/cosmic-queries-grab-bag-cosmology-crisis-with-paul-mecurio/

Thanks to our Patrons Eric Ennis, Bill Savage, Matt Schafer, Lawrence McKay, Lowell Irvin, Chris & Michael Johnson, Steve Vera, Nicole Vorisek, Logan Shanks, and Karen Larios for supporting us this week.

Photo Credit: NASA/JPL-Caltech/VLA/MPIA