watched Inexplicable Universe e5

NDGT got into dark matter and dark energy in episode 5 of The Inexplicable Universe starting off with the Pioneer anomaly. Both craft are moving slower through space than predicted and we don't know why. Funny timing given the upcoming anniversary of the Pioneer 11 launch, 5 April 1973. Tyson also discussed the energy state of the Universe in the Inexplicable Space topic. Net zero. Which is a good thing.