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Space's Deepest Secrets (2016)

Documentary

A new breed of explorer has taken space travel beyond the moon to unlock and reveal first-ever views of alien worlds and cosmic bodies far beyond anyone's imagination. "Space's Deepest Secrets" shares stories of the men and women who pushed their ingenuity and curiosity to uncover some of the most groundbreaking findings in the history of space exploration. Hourlong episodes cover NASA's New Horizons mission to Pluto, the Hubble Telescope, the twin Voyager explorations, and other past, current and future missions and projects.

IMDb rating
8.0 (300 votes)
Seasons
8
Streaming (US)
Discovery+ Amazon Channel · Philo · Science Channel · Discovery + · Spectrum On Demand
Language
EN
Type
TV series
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Ratings refreshed Jul 3, 2026 · 8 seasons indexed

Seasons

Season 1 (2016)

7.86 avg 14 episodes 8.3 → 8.9 57 min avg

Ep 1: 8.3 · 29 votesEp 2: 7.3 · 17 votesEp 3: 8.1 · 17 votesEp 4: 6.8 · 14 votesEp 5: 8.1 · 19 votesEp 6: 7.9 · 15 votesEp 7: 7.2 · 8 votesEp 8: 7.4 · 10 votesEp 9: 8.2 · 7 votesEp 10: 8.1 · 8 votesEp 11: 8.2 · 9 votesEp 12: 7.8 · 5 votesEp 13: 7.8 · 5 votesEp 14: 8.9 · 8 votes
Season 1 episodes — IMDb ratings
#TitleRatingVotes
1The Universe's Greatest Hits8.329
2The Hunt for Dark Energy7.317
3Death of the Solar System8.117
4Alien Oceans6.814
5Secret History of the Voyager Mission8.119
6The Plot Against Gravity7.915
7Attack of the Space Junk7.28
8Quest for the First Star7.410
9When the Sun Attacks8.27
10Inside NASA's Mission to Mars8.18
11Secret History of the Solar System8.29
12The Truth Behind Parallel Universes7.85
13Dark Secret of the Universe7.85
14Inside a Monster Black Hole8.98

Season 2 (2017)

8.26 avg 10 episodes 8.6 → 7.7 42 min avg

Ep 1: 8.6 · 10 votesEp 2: 8.3 · 11 votesEp 3: 8.0 · 6 votesEp 4: 9.0 · 10 votesEp 5: 8.9 · 11 votesEp 6: 8.1 · 9 votesEp 8: 8.0 · 7 votesEp 9: 8.2 · 10 votesEp 10: 7.8 · 8 votesEp 11: 7.7 · 8 votes
Season 2 episodes — IMDb ratings
#TitleRatingVotes
1NASA's Greatest Moments8.610
2Strangest Alien Storms8.311
3Was Einstein Wrong8.06
4Black Holes: The Einstein Prophecy9.010
5Secret History of Jupiter8.911
6Mysteries of Alien Volcanos8.19
8Race to Planet 98.07
9Rise of the Monster Stars8.210
10Stranger Signals from Alien Worlds7.88
11Secret History of the Big Bang7.78

Season 3 (2017)

8.18 avg 8 episodes 8.0 → 8.3 42 min avg

Ep 1: 8.0 · 8 votesEp 2: 8.0 · 9 votesEp 3: 8.0 · 8 votesEp 4: 8.2 · 11 votesEp 5: 8.1 · 12 votesEp 6: 8.0 · 7 votesEp 7: 8.8 · 10 votesEp 8: 8.3 · 7 votes
Season 3 episodes — IMDb ratings
#TitleRatingVotes
1Hunt for the Hidden Cosmos8.08
2When Meteors Attack8.09
3Inside the New Space Race8.08
4Search for Alien Earths8.211
5Cassini's Grand Finale8.112
6The Sun's Greatest Mysteries8.07
7Expedition Extraterrestrial8.810
8When Black Holes Collide8.37

Season 4 (2018)

8.12 avg 9 episodes 7.8 → 8.7 44 min avg

Ep 1: 7.8 · 10 votesEp 2: 7.7 · 8 votesEp 3: 7.8 · 6 votesEp 4: 8.2 · 7 votesEp 5: 8.2 · 6 votesEp 6: 8.4 · 6 votesEp 8: 8.6 · 6 votesEp 9: 7.7 · 10 votesEp 10: 8.7 · 7 votes
Season 4 episodes — IMDb ratings
#TitleRatingVotes
1The Time Travel Enigma7.810
2Mission to the Red Planet7.78
3Hunt for the edge of the Universe7.86
4Journey to Alien Earths8.27
5Wrath of the Black Hole8.26
6New Race to the Moon8.46
8Secret History of the Juno Mission8.66
9Mystery of the Northern Lights7.710
10Pluto's Strange Secrets8.77

Season 5 (2018)

8.63 avg 3 episodes 8.4 → 8.2 42 min avg

Ep 1: 8.4 · 6 votesEp 2: 9.3 · 7 votesEp 3: 8.2 · 6 votes
Season 5 episodes — IMDb ratings
#TitleRatingVotes
1Dark Origins of the Moon8.46
2Mystery of the Alien Megastructure9.37
3Journey to Saturn's Rings8.26

Season 6 (2019)

8.44 avg 9 episodes 8.0 → 8.3 42 min avg

Ep 1: 8.0 · 7 votesEp 2: 8.6 · 12 votesEp 3: 8.9 · 8 votesEp 4: 8.0 · 5 votesEp 5: 8.6 · 10 votesEp 6: 8.1 · 8 votesEp 9: 8.5 · 7 votesEp 10: 9.0 · 6 votesEp 11: 8.3 · 7 votes
Season 6 episodes — IMDb ratings
#TitleRatingVotes
1Mystery of the Alien Asteroid8.07
2Secrets of the Seven Earths8.612
3Alien Hell Storms8.98
4Finding Alien Moons8.05
5Dark Secrets of the Solar System8.610
6Is the Universe a Hologram?8.18
9Wrath of the Sun8.57
10Asteroid Apocalypse9.06
11Mars's Alien Secrets8.37

Season 7 (2020)

8.75 avg 4 episodes 8.3 → 9.0

Ep 1: 8.3 · 17 votesEp 2: 9.2 · 8 votesEp 3: 8.5 · 9 votesEp 4: 9.0 · 10 votes
Season 7 episodes — IMDb ratings
#TitleRatingVotes
1Pluto: Back From The Dead8.317
2Hunt for the Mars Aliens9.28
3Killing the Milky Way8.59
4Jupiter: Mystery of the Solar System9.010

Season 8 (2021)

8.10 avg 9 episodes 7.4 → 7.8 42 min avg

Ep 1: 7.4 · 10 votesEp 2: 7.8 · 10 votesEp 3: 8.4 · 9 votesEp 4: 7.3 · 25 votesEp 5: 8.0 · 8 votesEp 6: 8.6 · 7 votesEp 7: 8.6 · 6 votesEp 8: 9.0 · 6 votesEp 9: 7.8 · 5 votes
Season 8 episodes — IMDb ratings
#TitleRatingVotes
1Mystery of the Dead Planets7.410
2Space's Great Wall7.810
3Curse of the White Holes8.49
4Bermuda Triangle of Space7.325
5The Giant Ice Planets8.08
6Secrets of the Asteroids8.67
7Space Force Declassified8.66
8Secrets of the Hubble9.06
9SpaceX and NASA: Mars and Beyond7.85
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Episode ratings and vote counts from IMDb. Poster, overview, and streaming data from TMDB. Data refreshed 2026-07-03.

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