Overview Next episode Release date Best episodes Ratings graph Similar shows Cast THE TOP FIVE 01 10.0 SECRET HISTORY OF THE VOYAGER… S01E05 SERIES AVG 10.0 SEASONS 8 S1 S2 S3 S4 S5 S6 S7 S8 E1 E2 E3 E4 E5 E6 E7 E8 E9 E10 E11 E12 E13 E14 S01E01 The Universe's Greatest Hits — unrated S01E02 Hunt for Dark Energy — unrated S01E03 Death of the Solar System — unrated S01E04 Alien Oceans — unrated S01E05 Secret History of the Voyager Mission — 10.0 S01E05 10.0 S01E06 The Plot Against Gravity — unrated S01E07 Attack of the Space Junk — unrated S01E08 Quest for the First Star — unrated S01E09 When the Sun Attacks — unrated S01E10 Inside NASA's Mission to Mars — unrated S01E11 Secret History of the Solar System — unrated S01E12 The Truth Behind Parallel Universes — unrated S01E13 Dark Secret of the Universe — unrated S01E14 Inside a Monster Black Hole — unrated S02E01 NASA's Greatest Moments — unrated S02E02 Strangest Alien Storms — unrated S02E03 Black Holes: The Einstein Prophecy — unrated S02E04 Secret History of Jupiter — unrated S02E05 Mysteries of Alien Volcanoes — unrated S02E06 Curse of Dark Matter — unrated S02E07 Race to Planet 9 — unrated S02E08 Rise of the Monster Stars — unrated S02E09 Stranger Signals from Alien Worlds — unrated S02E10 Secret History of the Big Bang — unrated S03E01 Hunt for the Hidden Cosmos — unrated S03E02 When Meteors Attack — unrated S03E03 Inside the New Space Race — unrated S03E04 Search for Alien Earths — unrated S03E05 Cassini's Grand Finale — unrated S03E06 The Sun's Greatest Mysteries — unrated S03E07 Expedition Extraterrestrial — unrated S03E08 When Black Holes Collide — unrated S04E01 The Time Travel Enigma — unrated S04E02 Mission to the Red Planet — unrated S04E03 Hunt for the Edge of the Universe — unrated S04E04 Journey to Alien Earths — unrated S04E05 Wrath of the Black Hole — unrated S04E06 New Race to the Moon — unrated S04E07 Mars: The Next Frontier — unrated S04E08 Secret History of the Juno Mission — unrated S04E09 Mystery of the Northern Lights — unrated S04E10 Pluto's Strange Secrets — unrated S05E01 Dark Origins of the Moon — unrated S05E02 Mystery of the Alien Megastructure — unrated S05E03 Journey to Saturn's Rings — unrated S06E01 Mystery of the Alien Asteroid — unrated S06E02 Secrets of the Seven Earths — unrated S06E03 Alien Hell Storms — unrated S06E04 Finding Alien Moons — unrated S06E05 Dark Secrets of the Solar System — unrated S06E06 Is the Universe a Hologram — unrated S06E07 Curse of the Comets — unrated S06E08 Hunt for the Missing Black Holes — unrated S06E09 Wrath of the Sun — unrated S06E10 Asteroid Apocalypse — unrated S06E11 Mars' Alien Secrets — unrated S07E01 Pluto: Back From The Dead — unrated S07E02 Hunt for the Mars Aliens — unrated S07E03 Killing the Milky Way — unrated S07E04 Jupiter: Mystery of the Solar System — unrated S08E01 Mystery of the Dead Planets — unrated S08E02 Space's Great Wall — unrated S08E03 Curse of the White Holes — unrated S08E04 Bermuda Triangle of Space — unrated S08E05 The Giant Ice Planets — unrated S08E06 Secrets of the Asteroids — unrated S08E07 Space Force Declassified — unrated S08E08 The New Explorers — unrated AVG RATING SCALE 5.5 7.5 9.5 LOWEST RATED HIGHEST RATED Episode ratings grid for Space's Deepest Secrets: 1 rated episodes across 8 seasons, ratings 10.0–10.0. Peak: S01E05 Secret History of the Voyager Mission, 10.0.