The Cassini probe witnessed a gigantic storm that stretch all the way around Saturn.

A space shuttle's camera captured several white blinking dots on film near planet Earth. What are these objects and why were they blinking?

The U.S. Air Force created the Condon Report in 1968 to address supposed UFO sightings. The report stated that "further extensive study of UFO's probably cannot be justified" and is seen by some as an attempted government cover up.

Countless mysterious objects have been caught by NASA's cameras. Many astronauts have even reported seeing unidentified flying objects. Has NASA recorded the first traces of extraterrestrial life?

James McDivitt, a NASA astronaut and engineer in the 1960's, reported he saw and filmed a strange object in space. Is there a logical explanation or was there really something out there?

On a routine space walk, Astronaut Luca Parmitano starts to feel water building up in his helmet. Mission Control aborts the walk but Parmitano struggles to get back to the ISS as the water still rises.

It looked like a massive spacecraft launching from the sun. What was the mysterious dark object?

After the Apollo 16 astronauts return to Earth, photos taken in space appear to show an unidentified flying object floating near their craft. It takes decades for experts to determine what was hovering near the American astronauts.

Kepler-452b is the most Earth-like planet ever discovered. Is there a possibility we could move there in the future?

Space Shuttle Atlantis commander sees something strange outside the space shuttle and reports his sighting to mission control. What did he see?

As NASA's New Horizons probe was about to fly by Pluto, the probe's computer suddenly went offline, breaking communication with scientists on Earth.

Were "moon pigeons" spotted on Apollo 10 mission a warning for humans to stay away? Some people think so. This is the moon mission mystery you may not know about.

The first hi-resolution images of Mercury’s Caloris Basin reveal an enormous set of grooved valleys. These tentacl-like hollows earned Caloris the nickname "Mercury’s spider".

Residents of Utah see a strange fireball in the sky officially explained as a meteor – though it leaves no trace of landing. Is it evidence of a secret project - a space weapon named “Thor?” What does it do?

Astronauts working on the International Space Station spot something unexpected: a flying object under the space station. But... was it all a mistake?

Moments after Apollo 12 launched from the Kennedy Space Center in November 1969, lighting struck the spacecraft...and then the craft was struck a second time. Things only got stranger once the crew was in space.