Cold Warrior: December 1998 - NASA astronauts begin construction of the International Space Station and photograph a strange object that some link to the 1950s story of the 'Black Knight'.
Space Geysers: The Casini probe takes pictures of Saturn's moon Enceladus and sees massive geysers of liquid water on a moon that should be dead. These geysers also contain the building blocks of life.
Hole in the Sun: July 18, 2013 - Scientists observing the Sun see what appears to be a 500,000 mile hole creep across the Surface of the Sun.
Alien Spies: September 2002 - An amateur astronomer spots a bright object orbiting Earth. He reports the object to the authorities and NASA scientists are surprised to find the object covered in paint.
Martian Tracks: November 1971 - Mariner 9 arrives on Mars and sends back images of unusual tracks on the planet's surface.
Faster Than The Speed of Light: December 1995 - The Hubble Telescope is pointed at a completely empty spot of sky to see what's there and surprisingly the faint galaxies seen appear to be traveling faster than the speed of light.
STS-114 Boomerang: July 26, 2005 - One of the cameras from Space Shuttle Discovery sees an object change direction own its own.
We Are The Aliens: The theory of Panspermia is that life here on Earth may have originated elsewhere, by riding rocks to Earth after being knocked off other planets by asteroid strikes.
Aired: 11 Mar 2014