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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.

NASA's Unexplained Files

Mars's Deepest Secret

A probe malfunctions without cause as it enters deep space; a mission goes astray when an imposter breaches Mission Control; evidence of an invisible planet within the Solar System.

Mystery of the Invisible Planet

A theory of Earth's abiogenesis may have started in the clouds of Venus; a look into the claim of Earth having two moons; a NASA scientist helps the FBI solve the 1996 Olympic bombing.

Did Earth Have Two Moons?

Cosmonauts are trapped in a capsule in a frozen lake; a NASA scientist investigates the Hindenburg; the full moon affects experiments.

Curse of the Full Moon

Astronomers notice a planet in Earth's vicinity capable of supporting life; top secret military program exposed; the moon contains the components to start life.

The Earth Next Door

The discovery of geysers on a moon; NASA's mission to detect life; an object is spotted approaching an asteroid.

A President's Close Encounter

A mars mission captures an image of a strange structure on the planet; an intriguing sight on the dark side of the moon; a planet-eating star gives scientists a peek of Earth's bleak future.

Rise of the Planet Killer

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.

Pluto's Stranger Things

Some things are better left to science for an explanation.

S4 E4 | The Earth Next Door

E8 | Mars's Deepest Secret

E7 | Mystery of the Invisible Planet

E6 | Did Earth Have Two Moons?

E5 | Curse of the Full Moon

E4 | The Earth Next Door

E3 | A President's Close Encounter

E2 | Rise of the Planet Killer

E1 | Pluto's Stranger Things