The BEST episodes of NASA's Unexplained Files

Every episode of NASA's Unexplained Files ever, ranked from best to worst by thousands of votes from fans of the show. The best episodes of NASA's Unexplained Files!

Strange flying objects have been caught on NASA's cameras and astronauts have reported seeing UFOs. Some of the odd shapes and lights can be identified; others remain a mystery. We'll reveal NASA footage and interview the astronauts and scientists.

Last Updated: 1/9/2023Network:Science Channel
Mystery Space Squid
57 votes

#1 - Mystery Space Squid

Season 1 - Episode 7 - Aired 7/24/2014

What could make a NASA astronaut report seeing a flying saucer in the skies above a US Air Force test range? How have the swirling gases of Saturn formed a perfect Hexagon that has hovered above the planet’s pole for 30 years? 43 min | TV-PG | Premiered 07/24/2014 U.S. UFO: Capitan Gordon Cooper sends two camera men to the area to set up filming equipment a test site, but they film a UFO landing instead. The Mega Hex: The Voyager Space craft takes photos of Saturn and appears to show a giant Hexagon engulfing the poles. 24 years later the Casini spacecraft takes better pictures that confirm the hexagon is still there. Lunar Lights: Apollo 14 is plagued with technical problems, but they make it safely to the surface on the moon. After developing film taken on the moon show mysterious blue lights. Discovery Déja Vu: 2001 Space Shuttle Discovery external camera seem multiple objects moving independently. The WOW Factor: August 1977 a signal is picked up coming from deep space. Space Squid: December 1968 - Apollo 8 takes photos of the moon, but when developed the film show something with tentacles in space near the moon. Space Angels: Space Shuttle Atlantis films thunderstorms from space. The film shows giant discharges above the clouds, that look like electrified jellyfish. Interstellar Power Stations: Dr. Dick Carrigan is looking at the infrared data collected by observation satellites to find Dyson's Sphere.

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Ghosts on the Moon
83 votes

#2 - Ghosts on the Moon

Season 1 - Episode 6 - Aired 7/20/2014

Could spaceships be powered by atomic bombs? Can artificial rings encircle an entire star? why was Neil Armstrong’s transmission feed cut off when he spotted strange lights on the Moon? And how can lightning talk to itself? 43 min | TV-PG | Premiered 07/20/2014 The Aristarchus Enigma: Apollo 11 astronauts see illumination coming from the Aristarchus Crater. Martian Space Station: Mars moon Phobos may be hollow, that some believe may be a space station. Curiosity's Companions: After Curiosity lands on Mars one of the first things it sees are object apparently leaving the planet. Alien Star Drive: When an X-Ray signature is seen coming from a nearby Galactic Clusters may be an alien's nuclear drive. Intelligent Lighting: Lightning appears to flash in sequence between storms that are far apart. Mir Mystery: Objects buzz the Mir Space Station during the shuttle docking procedure. Many believe something has been trying to sabotage the station. Moon Watcher: Photos taken by the Apollo 17 astronauts seem to show an object apparently watching their activities. Kuiper Belt Intruder: More than 90% of the material that should be in the Kuiper Belt is not there.

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Interstellar Gold Rush
61 votes

#3 - Interstellar Gold Rush

Season 1 - Episode 5 - Aired 3/18/2014

A distant planet shows evidence of an Earth-like atmosphere, while a mysterious light suggests an atmosphere on the Moon. Have we found evidence of a crashed alien ship in the asteroid belt? Why are there "blueberries" on Mars? 43 min | TV-PG | Premiered 03/18/2014 Apollo 12 Follower: Shortly after Apollo 12's launch the ship is struck by lightning, twice. After the ship computers recover from the lightning strike the mission continues and strange objects are seen following the moon landing. Alien Crash Site: The Dawn space probe in 2011 studies Vesta, a 4.5 million year old asteroid in the Asteroid Belt. Pictures seem to show the crash site of a triangular shaped object. Could it be a failed attempt at mining asteroids for precious metals by a race from beyond the solar system. The Gemini X Incident: A mission meant to learn how to dock with booster rockets in space turns strange when the astronauts spot flashing objects that suddenly disappear. Alien Cloud: A planet 63 light years away is photographed by the Hubble Telescope. Studies of these photos show the presence of methane that may indicate life. Skylab's Gremlins: NASA's Skylab is plagued by accidents, almost from the start of the mission. While trying to figure out why the mission has so many problems scientists see a photo of a mysterious object that leave and then returns. Mars Blueberries: The Opportunity rover lands on Mars and the first thing it photographs is little round rocks that are less red than everything else seen on the planet. Hubble Encounter: On the mission to repair the Hubble Space Telescope, the crew sees multiple objects buzz the mission as if watching their progress. Moon Glow: Surveyor 7 lands on the Moon prior to the first manned mission and photographs an unexpected glow. When an Apollo 17 astronaut reports a glow on the horizon, NASA finally attempts to understand the phenomenon.

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Revenge of the Fireflies
60 votes

#4 - Revenge of the Fireflies

Season 2 - Episode 8 - Aired 5/27/2015

Something in space is attacking the brains of astronauts. What is it? Should NASA be worried about the sudden appearance of so-called space fireflies? Who is responsible for the bizarre glowing spiral in the skies over Norway?

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Hammer of Thor
67 votes

#5 - Hammer of Thor

Season 2 - Episode 3 - Aired 4/22/2015

Are burning lights above Nevada and Utah signs of a secret space weapons project? What are the odd trails on the lunar surface near the Apollo landing sites? Does a strange space object spell disaster for the Space Shuttle crew?

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Nazis on the Moon
59 votes

#6 - Nazis on the Moon

Season 2 - Episode 6 - Aired 5/13/2015

A Russian probe discovers the lunar soil was disturbed before the US or USSR got there. Did Nazis arrive first? Have scientists detected a laser signal from a planet capable of supporting life? Is there a Bermuda Triangle of Space?

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Attack of the Thunderballs
61 votes

#7 - Attack of the Thunderballs

Season 3 - Episode 8 - Aired 4/12/2016

Astronauts are evacuated when a mystery object is discovered hurtling towards the ISS, a NASA secret agent goes undercover to recover missing moon rocks & scientists struggle to find answers when they find a huge void at the edge of the solar system.

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Stonehenge on Mars
45 votes

#8 - Stonehenge on Mars

Season 5 - Episode 5 - Aired 5/10/2017

When NASA spots a something on Mars that resembles Stonehenge, they investigate what could have made this strange structure. Scientists discover a mysterious hole in Saturn's rings. An ancient tribe claims contact with alien visitors.

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Secret Aliens
49 votes

#9 - Secret Aliens

Season 5 - Episode 4 - Aired 5/3/2017

An astronomer records an unusual radio signal from beyond our solar system. FBI agents find classified documents at the home of a NASA scientist. When scientists discover strange DNA in the octopus, they examine if their origins could be alien.

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Mars' Deepest Secret
41 votes

#10 - Mars' Deepest Secret

Season 4 - Episode 8 - Aired 10/18/2016

Soviet photos of the moon are intercepted by the CIA; a malfunction aboard the ISS, which imperils the whole crew; NASA probe finds evidence of the possibility of life on Mars.

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Spacewalk of Doom
54 votes

#11 - Spacewalk of Doom

Season 2 - Episode 4 - Aired 4/29/2015

How could an astronaut on a spacewalk begin to drown? Have NASA scientists discovered an asteroid that was converted into a spacecraft? What are the strange objects spotted when NASA sends a secret payload into space?

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Life in Hell
112 votes

#12 - Life in Hell

Season 2 - Episode 1 - Aired 3/2/2015

A UFO crashes in Pennsylvania. Was it a secret Soviet satellite or something far more dangerous? On Mercury, NASA finds the impossible: frozen water. A strange object causes a skyscraper-sized shadow on the surface of Mars's largest moon. What is it?

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Lethal Weapons
85 votes

#13 - Lethal Weapons

Season 2 - Episode 7 - Aired 5/20/2015

How did pictures from the Hubble telescope make the comet of the century look like an alien spacecraft? Has earth already been invaded by alien organisms? What mysterious force is smashing a near-earth asteroid to pieces?

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Aliens vs. Stalin at Area 51
33 votes

#14 - Aliens vs. Stalin at Area 51

Season 6 - Episode 2 - Aired 4/18/2019

When a former Area 51 insider alleges that the Roswell UFO incident was a nefarious Soviet conspiracy masterminded by Stalin, experts investigate if it was indeed an enemy plot against America -- or if the confession is just another cover-up.

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Top Secret Terror
77 votes

#15 - Top Secret Terror

Season 2 - Episode 2 - Aired 3/4/2015

Was the Moon landing faked? Images of Mercury reveal massive spider-like formations on its surface. Is it a geological formation or something ominous? A classified Space Shuttle mission ends in near-disaster. What was its mission?

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Pluto Under Pressure
68 votes

#16 - Pluto Under Pressure

Season 3 - Episode 1 - Aired 2/23/2016

Lost tapes reveal that Apollo astronauts heard unexplained transmissions on the far side of the moon, an amateur astronomer spots a strange disturbance in Martian atmosphere & an unidentified object in Earth orbit starts stalking Russian spacecraft.

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Pilot- Friendship 7 & Gemini 4
88 votes

#17 - Pilot- Friendship 7 & Gemini 4

Season 1 - Episode 1 - Aired 3/27/2012

Friendship 7: February 1962 - John Glenn launches to become the first American to orbit the Earth. Once in space he sees that his capsule is surrounded by a swarm of small lights he calls fireflies. Gemini 4: June 1965 - Command pilot James McDivitt notices an object outside his craft. He describes it as having big arms sticking out of it. Gemini 7: December 1965 - Less than 2 hrs into their mission the astronauts report an object outside their craft. Gemini 11: September 1966 - One day after launch the astronauts notice a bright object outside their craft that appeared to chance shape. Apollo 11: July 1969 - A flashing object is seen outside their ship. Neil Armstrong makes a cryptic call back to NASA . Skylab 3: September 1973 - Pilot Jack Lousma reports a bright red flashing light following them for 20 minutes. STS-49: September 1991 - A Space Shuttle camera sees an object moving across the frame that changes direction after a flash. STS-75: February 1996 - Space Shuttle Columbia conducts electricity generation experiments. When the tether breaks a swarm of craft appear to surround the broken experiment as if floats away. STS-80: December 1996 - As shuttle cameras turn to Earth, white objects appear to come up from the Earth and move into a circular formation. STS-115: September 2006 - As the fuel tank is released from the shuttle launch and it moves away a triangular object appears to follow the tank back toward Earth.

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Pluto's Stranger Things
65 votes

#18 - Pluto's Stranger Things

Season 4 - Episode 1 - Aired 8/30/2016

Evidence of alien technology around a distant star; speculation about Pluto's surface; Apollo astronauts are at a loss of words to describe an object they encountered while they approached the moon. Science Channel has named this episode the first episode of season 4.

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Aliens in the Amazon
20 votes

#19 - Aliens in the Amazon

Season 6 - Episode 5 - Aired 5/9/2019

After Neil Armstrong's moonwalk, he led an expedition into the Amazon to find a legendary library that holds all knowledge of an advanced alien civilization. Experts ask if a close encounter on the moon's surface inspired Armstrong's mysterious quest.

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Pluto's Evil Twin
20 votes

#20 - Pluto's Evil Twin

Season 6 - Episode 4 - Aired 5/2/2019

After NASA's New Horizons spacecraft flies by Pluto, it encounters a strange alien world that shuts down the probe's computers, and experts investigate if this mysterious object is an alien spacecraft hiding at the edge of our solar system.

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Saturn's Moon Monsters
26 votes

#21 - Saturn's Moon Monsters

Season 6 - Episode 1 - Aired 4/11/2019

When NASA discovers something strange on Saturn's biggest moon, experts investigate if aliens feeding on the electric atmosphere could be the culprit. The disturbing evidence points to a grisly apocalypse if these monsters ever make it to Earth.

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The Moons Strange Secret
12 votes

#22 - The Moons Strange Secret

Season 5 - Episode 7 - Aired 2/3/2018

The last humans to walk on the Moon discover something strange on the surface. A NASA scientist investigates a strange phenomenon responsible for horrific mass deaths. A landmark NASA mission threatens to destroy the reputation of an American hero.

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Curse of the Red Planet
54 votes

#23 - Curse of the Red Planet

Season 3 - Episode 6 - Aired 3/29/2016

Three cosmonauts die mysteriously as they re-enter Earth's atmosphere. A declassified document reveals a CIA plan to use a space disaster as a cover to start war and a NASA rover discovers clues that help solve a murder.

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Did We Nuke Jupiter?
34 votes

#24 - Did We Nuke Jupiter?

Season 2 - Episode 5 - Aired 5/6/2015

Could NASA be responsible for a nuclear explosion on Jupiter? Could new evidence finally solve the mystery of the iconic face on Mars? What unknown force crashed a spacecraft from the Apollo program into the lunar surface?

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Did Aliens Nuke Mars?
32 votes

#25 - Did Aliens Nuke Mars?

Season 6 - Episode 8 - Aired 5/30/2019

A strange discovery by NASA's Mars Curiosity rover suggests the Red Planet was home to an alien nuclear war 300 million years ago, and experts investigate if an extraterrestrial Armageddon transformed an earth-like world into the wasteland we know today.

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