7.0/1021 votes#1 - Pluto's Stranger Things
Season 4 Episode 1 - Aired 8/30/2016
Astronomers find evidence for incredible alien technology around a distant star. The first pictures of Pluto may show something moving across its surface. Apollo astronauts see something they can't explain as they approach the Moon.
Director: N/A
Writer: N/A
7.1/1023 votes#2 - Rise of the Planet Killer
Season 4 Episode 2 - Aired 9/6/2016
A probe captures an image of a strange structure on Mars. Files from the first Apollo mission record an eerie sighting on the dark side of the Moon. A planet-eating star gives scientists a glimpse of Earth's terrible demise.
Director: N/A
Writer: N/A
7.5/1021 votes#3 - A President's Close Encounter
Season 4 Episode 3 - Aired 9/13/2016
Geysers are discovered on a frozen moon, and NASA redirects a probe on a daring mission to detect evidence of life. An unidentified object is spotted approaching a near-earth asteroid. A future president is an eyewitness to a UFO.
Director: N/A
Writer: N/A
7.3/1022 votes#4 - The Earth Next Door
Season 4 Episode 4 - Aired 9/20/2016
Astronomers detect a potentially habitable planet tantalizingly close to Earth. A chance discovery at NASA reveals a top secret military space program. The Apollo missions bring back evidence that the moon may be rich in the building blocks for life.
Director: N/A
Writer: N/A
6.9/1019 votes#5 - Curse of the Full Moon
Season 4 Episode 5 - Aired 9/27/2016
Two cosmonauts fight for their lives while trapped inside a capsule in a frozen lake. A NASA scientist investigates the deadly Nazi secret that doomed the Hindenburg. NASA astronomers are spooked when the full moon starts affecting their experiments.
Director: N/A
Writer: N/A
7.5/1025 votes#6 - Did Earth Have Two Moons?
Season 4 Episode 6 - Aired 10/4/2016
A discovery suggests the hellish clouds of Venus may be the origin of life on Earth. A bizarre sighting 2,000 years ago raises the possibility that Earth once had two moons. A scientist helps the FBI crack the 1996 Olympic bombing.
Director: N/A
Writer: N/A
7.5/1021 votes#7 - Mystery of the Invisible Planet
Season 4 Episode 7 - Aired 10/11/2016
A probe carrying a message to aliens malfunctions as it enters deep space. A NASA mission goes disastrously wrong when an imposter breaches Mission Control. Astronomers may have found an invisible planet around a distant star.
Director: N/A
Writer: N/A
7.5/1021 votes#8 - Mars's Deepest Secret
Season 4 Episode 8 - Aired 10/18/2016
British astronomers working for the CIA intercept Soviet photos of the moon. A malfunction on the ISS could poison its crew with ammonia gas. A startling image taken by a NASA probe points to evidence that life could exist on Mars.
Director: N/A
Writer: N/A
The Best Episodes of NASA's Unexplained Files Season 4
Every episode of NASA's Unexplained Files Season 4 ranked from best to worst. Discover the Best Episodes of NASA's Unexplained Files Season 4!
Dive into the mysteries of some of NASA’s most curious missions and explore stories of engineering achievement and human endurance. Each episode offers first hand...
Genres:DocumentaryTalkMystery
Network:Science
Season 4 Ratings Summary
"Pluto's Stranger Things" is the best rated episode of "NASA's Unexplained Files" season 4. It scored 7/10 based on 21 votes. Directed by N/A and written by N/A, it aired on 8/30/2016. This episode is rated 0.1 points higher than the second-best, "Rise of the Planet Killer".