Forces of the Unknown
- Episode aired Jun 8, 2020
- TV-PG
- 2h 6m
![How the Universe Works (2010)](https://m.media-amazon.com/images/M/MV5BODBmYWVkMzUtNjkzMi00YjcwLWE1M2MtM2I4OThkMzc3MzNkXkEyXkFqcGdeQXVyNTg3NDkzMzM@._V1_QL75_UX190_CR0,2,190,281_.jpg)
This off-season episode was made up of three other regular season episodes of How the Universe Works: S8.7 Edge of the Universe, S7.3 The Interstellar Mysteries, and S4.4 Edge of the Solar S... Read allThis off-season episode was made up of three other regular season episodes of How the Universe Works: S8.7 Edge of the Universe, S7.3 The Interstellar Mysteries, and S4.4 Edge of the Solar System.This off-season episode was made up of three other regular season episodes of How the Universe Works: S8.7 Edge of the Universe, S7.3 The Interstellar Mysteries, and S4.4 Edge of the Solar System.