
NASA's Unexplained Files
Looking at how the comet of the century looks like an alien spacecraft.

Looking at how the comet of the century looks like an alien spacecraft.

New evidence could finally reveal the truth behind the mystery of the face on Mars.

Images of Mercury show spider-like formations; A space shuttle mission almost ends in disaster.

The power of atomic bombs; artificial rings; Neil Armstrong's transmission on the moon.

The swirling gases of Saturn form a perfect hexagon that has hovered above the planet for 30 years.

A distant planet shows an Earth-like atmosphere; a glowing light suggests an atmosphere on the Moon.

A piece of the sun seems to have vanished; the Hubble spots an unidentified object.

Life may have been found on Mars; mysterious Moon Pigeons.

Exploring dwarf planets, home to some of the universe's biggest secrets.

Astronaut Mike Massimino uncovers the strange secrets of Earth's solar system.

Astronaut Mike Massimino explores Mercury, a deadly and tiny planet that faces constant attacks.

Journeying to Uranus and Neptune, the farthest planets from the sun.

Engineers count down the final moments in the world's first ever privately funded moon mission.

Experts uncover evidence of catastrophic military testing in the desert landscape of New Meixco.

Experts investigate Cold War evidence to reveal an Atlantis-like city built by the Soviets.

Experts investigate a gigantic ship that emerges from the sands of a strange island.

Experts investigate evidence of a mysterious structure in a remote and rocky area of Hawaii.

Uncovering a gravesite with remains of decapitated skeletons and possible vampire burials.

Experts investigate a war-torn fortress with a connection to the ruins of a military installation.

Experts uncover a burial ground that may have been a portal to the Viking spiritual realm.