The BEST episodes of Space's Deepest Secrets
Every episode of Space's Deepest Secrets ever, ranked from best to worst by thousands of votes from fans of the show. The best episodes of Space's Deepest Secrets!
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 - Quest for the First Star
Season 1 - Episode 8 - Aired 6/14/2016
The search for the first stars of the universe.
#3 - Mission to the Red Planet
Season 4 - Episode 2 - Aired 5/22/2018
The latest science shows what it would take to build colonies on Mars and why human colonization of the Red Planet may take place in the not-too-distant future.
#4 - Journey to Alien Earths
Season 4 - Episode 4 - Aired 6/5/2018
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.
#5 - The Universe's Greatest Hits
Season 1 - Episode 1 - Aired 4/26/2016
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.
Watch Now:Apple TV
#6 - Mars: The Next Frontier
Season 4 - Episode 7 - Aired 6/26/2018
Modern day explorers are competing in a new space race to send the first people to Mars.
#7 - Dark Secrets of the Solar System
Season 6 - Episode 5 - Aired 4/16/2019
New evidence is rewriting the history of our solar system, and using the latest discoveries and cutting-edge tech, experts are investigating if our cosmic neighborhood once featured oversized alien Earths and a second Sun.
#9 - Secrets of the Asteroids
Season 8 - Episode 6 - Aired 5/5/2021
One of NASA's most ambitious missions is investigating an asteroid in more detail than ever before, revealing how space rocks can kick-start life on other planets and how they could possibly hold answers to the secrets of the Solar System
#10 - The Plot Against Gravity
Season 1 - Episode 6 - Aired 5/31/2016
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.
#11 - Mystery of the Alien Megastructure
Season 5 - Episode 2 - Aired 10/22/2018
A mysterious star hundreds of light years away might hold the hard evidence of extraterrestrial life, as experts speculate that its bizarre behavior points to proof of a massive alien-made megastructure.
#12 - Journey to Saturn's Rings
Season 5 - Episode 3 - Aired 10/29/2018
New discoveries change everything known about Saturn's rings, revealing that they're newer and more mysterious than ever imagined, and that some day soon, they might disappear forever.
#13 - Pluto's Strange Secrets
Season 4 - Episode 10 - Aired 10/14/2018
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.
#14 - Secret History of the Solar System
Season 1 - Episode 11 - Aired 8/6/2016
The discovery of exoplanets pushes scientists to reexamine the origin of the Solar System; the evidence infers a tale of unrestrained collisions and chaos.
#15 - Secret History of the Voyager Mission
Season 1 - Episode 5 - Aired 5/24/2016
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.
#16 - Secret History of the Juno Mission
Season 4 - Episode 8 - Aired 7/10/2018
NASA’s Juno mission explored Jupiter, and its images reveal the gas giant’s deepest secrets.
#17 - The Time Travel Enigma
Season 4 - Episode 1 - Aired 5/15/2018
Scientists may be on the verge of cracking time travel, one of the universe's greatest puzzles, due to new discoveries in space and theoretical physics.
#19 - Hunt for the Missing Black Holes
Season 6 - Episode 8 - Aired 5/7/2019
New discoveries might finally reveal how supermassive black holes are made, and using the latest technology, experts are on the verge of understanding how these monsters grow and how they affect life on our planet.
#20 - Inside a Monster Black Hole
Season 1 - Episode 14 - Aired 8/27/2016
Inside the supermassive black hole that sits in the middle of our galaxy.
#21 - Alien Oceans
Season 1 - Episode 4 - Aired 5/17/2016
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.
#22 - Hunt for the Mars Aliens
Season 7 - Episode 2 - Aired 9/15/2020
NASA's brand-new Mars rover is on the hunt for alien life, and with the help of cutting-edge engineering, scientists embark on a search for fossilized remains, which might prove the Red Planet was once home to a vast ocean and extraterrestrial life.
Watch Now:Apple TV
#23 - Mystery Of The Dead Planets
Season 8 - Episode 1 - Aired 3/31/2021
Astronomers are laying the groundwork to locate a new planet for the human race to inhabit, and the more alien worlds they discover and encounter, the more they unmask the mysterious and truly destructive nature of the cosmos.
Watch Now:Amazon
#24 - Dark Origins of the Moon
Season 5 - Episode 1 - Aired 10/15/2018
New discoveries reveal that everything known about the moon could be wrong; investigators race to understand the mysteries of its dark and violent past.
#25 - Secret History of Jupiter
Season 2 - Episode 4 - Aired 5/2/2017
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.