Season
- Season 0 2017-04-10
- Season 1 2015-02-11
- Season 2015 2015-02-11
- Season 2016 2016-01-06
- Season 2017 2017-01-04
- Season 2018 2018-01-10
- Season 2019 2019-01-09
- Season 2020 2020-01-06
- Season 2021 2021-01-12
- Season 2022 2022-01-12
- Season 2023 2023-01-11
- Season 2024 2024-01-10
- Season 2025 2025-01-16
- Season 2026 2026-01-13
Season 2026 Episode
- Season 2019 Episode 1
- Season 2019 Episode 2
- Season 2019 Episode 3
- Season 2019 Episode 4
- Season 2019 Episode 5
- Season 2019 Episode 6
- Season 2019 Episode 7
- Season 2019 Episode 8
- Season 2019 Episode 9
- Season 2019 Episode 10
- Season 2019 Episode 11
- Season 2019 Episode 12
- Season 2019 Episode 13
- Season 2019 Episode 14
- Season 2019 Episode 15
- Season 2019 Episode 16
- Season 2019 Episode 17
- Season 2019 Episode 18
- Season 2019 Episode 19
- Season 2019 Episode 20
- Season 2019 Episode 21
- Season 2019 Episode 22
- Season 2019 Episode 23
- Season 2019 Episode 24
- Season 2019 Episode 25
- Season 2019 Episode 26
- Season 2019 Episode 27
- Season 2019 Episode 28
- Season 2019 Episode 29
- Season 2019 Episode 30
- Season 2019 Episode 31
- Season 2019 Episode 32
- Season 2019 Episode 33
- Season 2019 Episode 34
- Season 2019 Episode 35
- Season 2019 Episode 36
- Season 2019 Episode 37
- Season 2019 Episode 38
- Season 2019 Episode 39
- Season 2019 Episode 40
PBS Space Time - Season 2019 Episode 30 Is Pluto a Planet?
10.00 48 minutes You know what a planet is, right? A big round thing that orbits a star. Uh, not so fast. The surprisingly vicious debate over the planetary status of Pluto has given us a fascinating glimpse into what a scientific definition really is. And perhaps the word planet is too vague to be used as a scientific definition at all.
