
NASA's Unexplained Files
NASA tracks an asteroid heading towards Earth but make an incredible discovery.

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.

Two astronauts trapped in the vacuum of space face a horrible death.

The Rosetta spacecraft discovers a comet that appears to be singing.

Astronauts evacuate when a mystery object hurtles toward the International Space Station.

Recently discovered documents show NASA's secret plan B for failure of the first moon landing.

Three cosmonauts mysteriously die as they re-enter Earth's atmosphere and NASA needs to know why.

An Apollo 17 photo seems to show a US military outpost on the Moon.

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.