Where To Stream How the Universe Works Season 6 Episode 6
Secret History of Mercury
- Aired February 13, 2018
- 60 Min
- Rated 8.5
- Number 37 Of 92 Rated Episodes
Mercury is a deadly world, facing attacks from the Sun, comets, and other planets; even though it's the smallest planet in the solar system, Mercury has a dangerous secret that may one day threaten life on Earth.