A mysterious object is orbiting Saturn, and it looks just like the Death Star; new evidence might shed new light on the mysterious death of Yuri Gagarin, the first man in space; when a cutting-edge satellite vanishes, fears of a space war escalate.
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.
When the Soviet Union unveils its own space shuttle, the CIA hatches a secret revenge plot; recent discoveries shed new light on the destruction of Sodom and Gomorrah; a missing nuclear weapon could threaten a NASA base in the Arctic.
A NASA probe captures an image of a familiar structure on Mars' surface.
Geologists discover alien deposits on Earth.
A photograph depicts two suns in the sky over Indonesia; ghostly white swirls on the moon's surface baffle NASA scientists; an astronaut disappears during his return to Earth.
Scientists wonder why Jupiter is hotter than it should be; the Curiosity Rover finds something strange on Mars; detectives turn to NASA for help with a murder cold case.
A declassified letter written by President Kennedy demands that the CIA share its UFO data with NASA; a bizarre pattern on the surface of Mars could be a coded alien message; investigators find a rocket crash-landed in a crater on the Moon.
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.
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.
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.
Cosmonauts are trapped in a capsule in a frozen lake; a NASA scientist investigates the Hindenburg; the full moon affects experiments.
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 discovery of geysers on a moon; NASA's mission to detect life; an object is spotted approaching an asteroid.
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.
A strange object causes a skyscraper-sized shadow on the surface of Mars's largest moon; something is moving beneath the frozen surface of one of Jupiter's moons.
Strange sightings on the planet Mars; the Curiosity rover captures an image of what appears to be pillars of fire; an astronomer sees signs of life on Mars.
In the Bermuda Triangle of Space, a mysterious energy attacks NASA craft in earth's orbit; witnesses report terrifying encounters with eerie spheres of light.
The International Space Station makes interesting encounters while in orbit; space fireflies, space debris and other problems.
Strange sightings on the moon; the possibility of a military base on the moon; the existence of lunar life forms; a strange substance found during moon missions.
Neil Armstrong faces death in space; a capsule carrying an astronaut back to Earth vanishes; an astronaut starts to drown during a spacewalk.
Astronauts evacuate when a mystery object hurtles toward the ISS; a NASA secret agent goes undercover to retrieve missing moon rocks; scientists struggle to find answers when they discover a huge void at the edge of the solar system.
Two astronauts trapped in the vacuum of space face a horrible death; the first close up images of Pluto show an alien landscape; residents of Houston struggle to explain videos of unidentified flying lights captured above their city at night.
Three cosmonauts mysteriously die as they re-enter Earth's atmosphere and NASA needs to know why; a declassified document shows a CIA plan to use a space disaster as a cover to start World War 3.
Recently discovered documents show NASA's secret plan B for failure of the first moon landing; a Soyuz capsule carrying NASA astronaut Peggy Whitson back to Earth goes missing; NASA's Cassini mission unravels a three hundred year old.
When a Chinese moon rover breaks down, a scientist at NASA points to a mysterious material that seemed to sabotage the Apollo missions decades earlier; the Rosetta spacecraft discovers a comet that appears to be singing.
Apollo 12 astronauts bring back something alive from the moon; NASA tracks an asteroid heading towards Earth but make an incredible discovery.
Lost tapes show that Apollo astronauts heard unexplained transmissions on the far side of the moon; an amateur astronomer finds an odd disturbance in Martian atmosphere; an unidentified object in Earth orbit starts stalking Russian spacecraft.
Something in space is attacking astronaut's brains; NASA might be worried about the sudden appearance of so-called space fireflies.
Looking at how pictures from the Hubble telescope make the comet of the century look like an alien spacecraft; earth may have already been invaded by alien organisms.
A Russian probe uncovers something has disturbed the lunar soil before the US or the USSR got there; scientists may have detected a laser signal from a planet capable of supporting life.
NASA could be responsible for a nuclear explosion on Jupiter; new evidence could finally reveal the truth behind the mystery of the iconic face on Mars; looking at the unknown force that crashed a spacecraft from the Apollo program.
Examining how an astronaut on a spacewalk begins to drown; NASA scientists may have uncovered an asteroid that's been converted into a spacecraft.
Burning lights in the skies above Nevada and Utah could be signs of a secret space weapons project; mysterious trails on the lunar surface near the Apollo landing sites.
Images of Mercury show large spider-like formations on its surface; A classifed space shuttle mission almost ends in disaster.
What was thought to be a secret Soviet satellite could have been a UFO crashing in Pennsylvania; NASA makes an unbelievable discovery, frozen water on Mercury.
Answers to questions about the power of atomic bombs, artificial rings, Neil Armstrong's transmission on the moon and lightning.
A NASA astronaut reports seeing a flying saucer in the skies above a U.S. Air Force test range; the swirling gases of Saturn form a perfect hexagon that has hovered above the planet's pole for 30 years.
A distant planet shows an Earth-like atmosphere; a glowing light suggests an atmosphere on the Moon; why there are blueberries on Mars.
A piece of the sun seems to have vanished; the Hubble spots an unidentified object traveling faster than light.
Life may have been found on Mars; mysterious Moon Pigeons.
An astronauts space walk is disrupted by bright light; a flying saucer is photographed.
Counting down the most terrifying moments and the strangest and most mysterious phenomena in NASA's history.
Counting down the most narrow escapes, and the strange, unexplainable and almost deadly phenomena astronauts face.
Our moon has been the home of some of the strangest and most mysterious phenomena in the universe; counting down the moon's most perplexing mysteries.
Mars is the home of some of the strangest and most mysterious phenomena in the universe; counting down the Red Planet's greatest mysteries.