Space's Deepest Secrets

The BEST episodes of Space's Deepest Secrets

Every episode ever - ranked by fan votes!

The stories of deep-space explorers who are risking their careers, and even their lives, to lead humanity to worlds yet to be seen.

Last Updated: 5/23/2022Network: Science Channel
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Quest for the First Star
star
8.71
7 votes

#1 - Quest for the First Star

Season 1 - Episode 8 - Aired 6/14/2016

The search for the first stars of the universe.

Attack of the Space Junk
star
8.33
6 votes

#2 - Attack of the Space Junk

Season 1 - Episode 7 - Aired 6/7/2016

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.

Mission to the Red Planet
star
8.21
14 votes

#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.

Watch Now:AmazoniTunes
Journey to Alien Earths
star
8.00
18 votes

#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.

Watch Now:iTunes
Mars: The Next Frontier
star
8.00
11 votes

#5 - 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.

Watch Now:Amazon
Journey to Saturn's Rings
star
8.00
13 votes

#6 - 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.

Watch Now:AmazoniTunes
Pluto's Strange Secrets
star
8.00
4 votes

#7 - 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.

Watch Now:Amazon
The Universe's Greatest Hits
star
7.90
145 votes

#8 - 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:Amazon
Dark Secrets of the Solar System
star
7.86
22 votes

#9 - 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.

Watch Now:Amazon
Mystery of the Alien Megastructure
star
7.86
14 votes

#10 - 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.

Watch Now:AmazoniTunes
NASA's Greatest Moments
star
7.85
54 votes

#11 - NASA's Greatest Moments

Season 2 - Episode 1 - Aired 4/11/2017

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

Secret History of the Solar System
star
7.83
30 votes

#12 - 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.

Watch Now:Amazon
Secret History of the Voyager Mission
star
7.83
58 votes

#13 - 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.

Watch Now:Amazon
The Time Travel Enigma
star
7.82
22 votes

#14 - 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.

Watch Now:AmazoniTunes
Secret History of the Juno Mission
star
7.82
22 votes

#15 - 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.

Watch Now:Amazon
Pluto: Back From The Dead
star
7.82
22 votes

#16 - Pluto: Back From The Dead

Season 7 - Episode 1 - Aired 9/8/2020

A spacecraft captures the first close-up images of the dwarf planet Pluto.

Watch Now:Amazon
Space's Great Wall
star
7.80
10 votes

#17 - Space's Great Wall

Season 8 - Episode 2 - Aired 4/7/2021

Astronomers make an extraordinary discovery when they uncover a cosmic mega-structure that's one billion light-years long, and now investigators race to decode the hidden forces that shape the most massive and mysterious structure known in the Universe.

Inside a Monster Black Hole
star
7.79
29 votes

#18 - 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.

Hunt  for the Missing Black Holes
star
7.76
25 votes

#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.

Watch Now:Amazon
The Plot Against Gravity
star
7.75
61 votes

#20 - 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.

Dark Origins of the Moon
star
7.75
16 votes

#21 - 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.

Watch Now:AmazoniTunes
Is the Universe a Hologram?
star
7.75
16 votes

#22 - Is the Universe a Hologram?

Season 6 - Episode 6 - Aired 4/23/2019

Shocking new evidence has convinced some of the world's greatest physicists that the universe is a hologram, and using cutting-edge technology, they investigate the secrets of black holes and space-time to build the case for this game-changing discovery.

Watch Now:Amazon
Mystery Of The Dead Planets
star
7.73
11 votes

#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.

New Race to the Moon
star
7.72
18 votes

#24 - New Race to the Moon

Season 4 - Episode 6 - Aired 6/19/2018

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.

Watch Now:Amazon
Alien Oceans
star
7.72
60 votes

#25 - 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.

Watch Now:Amazon