Season 4 - Episode Guide

Time travel is less impossible than we think, and the newest discoveries in space and theoretical physics have us on the brink of cracking one of the universe's greatest puzzles.

The latest science reveals what it would be like to build colonies on Mars, and how our future on the Red Planet might be closer than we think.

New discoveries are helping experts map the entire universe, and they are finding strange truths about the cosmos and its unimaginable size.

New discoveries of alien earths reveal vital clues in finding extraterrestrial life, using the latest science and technology, experts reveal the strange landscapes and oceans of these distant worlds.

New discoveries change everything known about black holes, and using the latest science and technology, experts reveal secrets to the mysteries behind these strange and deadly places.

New discoveries reveal that our Moon could be the next home for human life, triggering a new international space race to make it the home of humanity's first space colony.

Modern-day explorers are competing in a new space race to send the first people to Mars, and cutting-edge technology might make the Red Planet the next home for human life.

NASA's Juno mission is the closest we've ever explored Jupiter, and its incredible images reveal the Gas Giant's deepest secrets and how this deadly world helped create our solar system.

The aurora borealis is one of Earth's most incredible sights, and new discoveries finally explain why these mysterious lights appear and what they reveal about the Sun's sinister and deadly powers.

NASA's mission to Pluto gathered the first close-up pictures of this strange and distant world, and now, new discoveries and the latest science reveal the secrets of its alien features, which could point to extraterrestrial life.

NASA's Voyager, Cassini, and Juno missions are groundbreaking scientific feats that changed everything we know about our universe, and testimony from the modern-day explorers behind these expeditions reveal the incredible secrets they discovered. This is a mashup of Space's Deepest Secrets: S01E05, "Secret History of the Voyager Mission", S03E05, "Cassini's Grand Finale", and S04E08, "Secret History of the Juno Mission".

New discoveries reveal the dangers that asteroids pose to planet Earth, but these rocky worlds could be the next destination for human space colonization. This episode is a mashup of TBD and "How the Universe Works", S06E09, "War on Asteroids".

New discoveries reveal the dark power of the Sun and how its strange behavior affects life on Earth. This is a mashup of "Space's Deepest Secrets," S04E09, "Mystery of the Northern Lights" and S03E06, "The Sun's Greatest Mysteries." 

New discoveries from NASA's expedition to Jupiter have changed everything we thought we knew about this strange and deadly world. This is a mashup of "Space's Deepest Secrets", S04E08, "Secret History of the Juno Mission" and S02E04, "Secret History of Jupiter".

New discoveries reveal the mysteries and dangers on Mars, and if the planet is ready to support a human civilization. This is a mashup of "Space's Deepest Secrets", S04E02, "Mission to the Red Planet" and S04E07, "Mars: The Next Frontier" plus another Science Channel show "Strip the Cosmos", S01E04, "Expedition Mars".

The latest science sheds new light on our Moon, a secret world of mysterious phenomena and a possible new home for humanity. This is a mashup of "Space's Deepest Secrets", S04E06, "New Race to the Moon", and "How the Universe Works", S04E06, "Secret History of the Moon".

New discoveries reveal the secrets of black holes, the universe's most dangerous and mysterious phenomenon. This is a mashup of "Space's Deepest Secrets", S04E05, "Wrath of the Black Hole" and S02E03, "Black Holes: The Einstein Prophecy".

New discoveries uncover the secrets of the universe's strange alien worlds that could be home to extraterrestrial life. This is a mashup of "Space's Deepest Secrets", S04E04, "Journey to Alien Earths" and "How the Universe Works", S05E08, "Strangest Alien Worlds".

New discoveries reveal the secrets of the universe's most unknown and mysterious places. This is a mashup of "Space's Deepest Secrets", S04E03, "Hunt for the Edge of the Universe" and S03E01, "Hunt for the Hidden Cosmos".

New discoveries reveal that Mars was once home to alien life, and today, modern-day explorers are trying to transform this desert world into a new Earth-like planet for humans. This is a mashup of "Space's Deepest Secrets", S04E02, "Mission to the Red Planet" and "How the Universe Works", S05E06, "Life and Death on the Red Planet".

An investigation into whether parallel universes exist and the possibility of traveling through time and space to reach them. This is a mashup of "Space's Deepest Secrets", S04E01, "The Time Travel Enigma" and S01E12, "The Truth Behind Parallel Universes".

The latest discoveries reveal the dark secrets behind the Big Bang, the mysterious moment when the universe was born. This episode is a duplicate of "Mysteries of the Big Bang" which is a mashup of "Space's Deepest Secrets", S02E10, "Secret History of the Big Bang" and S01E08, "Quest for the First Star".

The latest discoveries reveal the dark secrets of the deadliest stars of the cosmos. This episode is a mashup of "Space's Deepest Secrets", S02E08, "Rise of the Monster Stars" and "How the Universe Works", S05E04, "Stars That Kill".