The BEST Episodes of Space's Deepest Secrets
Every episode ever - ranked by fan votes!
Last Updated: Apr 22, 2021
Network: Science Channel
The stories of deep-space explorers who are risking their careers, and even their lives, to lead humanity to worlds yet to be seen.
#1 - The Universe's Greatest Hits
Season 1 - Episode 1 - Aired Apr 26, 2016
From the mission that saw Pluto for the first time to the Mars rovers, a new breed of explorers are risking their careers, and even their lives, to lead humanity to worlds we have never seen and tackle the mysteries of life itself.
#2 - NASA's Greatest Moments
Season 2 - Episode 1 - Aired Apr 11, 2017
Counting down the greatest moments in NASA's nearly sixty year history, revealing the incredible stories behind the missions and discoveries that have remade our understanding of the Final Frontier
#3 - Hunt for Dark Energy
Season 1 - Episode 2 - Aired May 3, 2016
World scientists are searching for Dark Energy, the biggest challenge of physics; In Europe, a multi-billion dollar satellite will map the sky from space.
#4 - Death of the Solar System
Season 1 - Episode 3 - Aired May 10, 2016
An exploration of the dramatic fate of our future descendants, the technology they’ll need to survive the end of this world billions of years from now and our options for colonizing and starting again on a new planet somewhere far from Earth.
#5 - Alien Oceans
Season 1 - Episode 4 - Aired May 17, 2016
A soaring quest through the solar system’s exotic and hidden water realms, from the deep seas below the icy crust of Europa to the vast prehistoric oceans that once existed on Mars billions of years ago.
#6 - Secret History of the Voyager Mission
Season 1 - Episode 5 - Aired May 24, 2016
Thirty-five years after leaving Earth, the Voyager spacecraft is going to leave the Solar System to tell the incredible story of a mission that was only supposed to last five years but is still going today.
#7 - The Plot Against Gravity
Season 1 - Episode 6 - Aired May 31, 2016
The story of how a large aerospace company, BAE Systems, began a secret project to counter the force of gravity while NASA simultaneously ran a similar ‘Breakthrough Propulsion Physics’ program.
#8 - Attack of the Space Junk
Season 1 - Episode 7 - Aired Jun 7, 2016
The efforts of the U.S. government and others to combat the threat posed by space junk, which could derail the future of space travel if left unchecked.
#9 - Quest for the First Star
Season 1 - Episode 8 - Aired Jun 14, 2016
The search for the first stars of the universe.
#10 - When the Sun Attacks
Season 1 - Episode 9 - Aired Jun 21, 2016
When the sun flares up, billions of tons of superheated gas and intense radiation are propelled toward Earth; experts are trying to predict what is coming toward the Earth and how to prepare for this threat.
#11 - Inside NASA's Mission to Mars
Season 1 - Episode 10 - Aired Jun 28, 2016
An in-depth look at how NASA is preparing for its most ambitious and dangerous mission yet; to land a human being on the surface of Mars.
#12 - Secret History of the Solar System
Season 1 - Episode 11 - Aired Aug 6, 2016
The discovery of exoplanets pushes scientists to reexamine the origin of the Solar System; the evidence infers a tale of unrestrained collisions and chaos.
#13 - The Truth Behind Parallel Universes
Season 1 - Episode 12 - Aired Aug 13, 2016
Scientists are working to determine if parallel universes exist.
#14 - Dark Secret of the Universe
Season 1 - Episode 13 - Aired Aug 20, 2016
Scientists are finally on the hunt to finally crack the dark secrets of the atoms that make up the universe.
#15 - Inside a Monster Black Hole
Season 1 - Episode 14 - Aired Aug 27, 2016
Inside the supermassive black hole that sits in the middle of our galaxy.
#16 - Strangest Alien Storms
Season 2 - Episode 2 - Aired Apr 18, 2017
New discoveries on alien planets reveal the most violent storms and strangest weather in the universe including the possibility of raining rubies and diamonds, frozen wastelands and hellish infernos.
#17 - Black Holes: The Einstein Prophecy
Season 2 - Episode 3 - Aired Apr 25, 2017
Researchers investigate the dark secrets of the mysterious phenomenon known as black holes.
#18 - Secret History of Jupiter
Season 2 - Episode 4 - Aired May 2, 2017
NASA's Juno mission reveals secrets about Jupiter, a strange world that is more like a star than a planet; learning what lies beneath the planet's violent storms provides scientists with a new understanding of the solar system.
#19 - Curse of Dark Matter
Season 2 - Episode 6 - Aired May 16, 2017
Recent discoveries have revealed vast clouds of dark matter in the universe; this mysterious matter could be proof that multiple universes exist; researchers investigate the secrets of dark matter.
#20 - Race to Planet 9
Season 2 - Episode 7 - Aired May 23, 2017
Scientists believe that there is an undiscovered massive planet lurking at the edge of the solar system. Join researchers as they hunt for this mysterious world, an investigation that could reveal the secret history of the solar system's formation.
#21 - Rise of the Monster Stars
Season 2 - Episode 8 - Aired May 30, 2017
The most extreme stars in our universe could be the key to understanding life in the cosmos. These monster stars are among the oldest in the universe, and can be hundreds of times larger than our Sun and burn over million times brighter.
#22 - Stranger Signals from Alien Worlds
Season 2 - Episode 9 - Aired Jun 6, 2017
For decades, researchers have been scouring the universe for signals from extraterrestrials. New discoveries reveal mysterious fast radio bursts from space that may be the key to confirming life in the cosmos.
#23 - Mysteries of Alien Volcanoes
Season 2 - Episode 5 - Aired May 9, 2017
New research into our solar system's alien volcanoes reveal shocking discoveries; many of these fiery wonders are similar to the volcanoes on Earth, and some might even have created the conditions for extraterrestrial life.
#24 - Secret History of the Big Bang
Season 2 - Episode 10 - Aired Jun 13, 2017
Scientists are on a race to find the beginning of time and space: the Big Bang; cutting-edge technology helps astronomers look back in time to uncover the mysteries of our universe's creation, revealing the first moments of the cosmos.
#25 - Hunt for the Hidden Cosmos
Season 3 - Episode 1 - Aired Aug 22, 2017
New telescope technology has helped astronomers to explore the never-before-seen invisible universe. These modern marvels ushered in a new age of discovery, revealing secrets of greatest enigmas in the cosmos, from giant black holes to supernovas.