dark energy, cosmology part 2: crash course astronomy #43 Published 8 years ago • 1.1M plays • Length 11:23 Download video MP4 Download video MP3 Similar videos 13:23 the big bang, cosmology part 1: crash course astronomy #42 59:40 mapping the universe: dark energy, black holes, and gravity – with chris clarkson 1:10:31 is dark energy decaying? 10:11 who created 'nothing' our universe formed from 12:00 dark matter: crash course astronomy #41