This special Are We Alone? edition of NASA's Unexplained Files features brand-new content and interviews. Did we find life on Mars, and is someone covering it up? Was an alien spaceship spotted in the Aurora Borealis?

Source: The Science Channel

The Season 2 premiere examines an alleged UFO crash in Pennsylvania that may have been a Soviet satellite; whether Mercury houses life; and a skyscraper-sized shadow on the surface of Mars' largest moon.

Source: Science

Images of Mercury show large spider-like formations on its surface; A classifed space shuttle mission almost ends in disaster.

Source: The Science Channel

Are burning lights in the skies above Nevada and Utah signs of a secret space weapons project? What are the mysterious trails on the lunar surface near the Apollo landing sites? Does a strange space object spell disaster for the crew of the space shuttle?

Source: The SCIENCE Channel

An astronaut on a spacewalk begins to drown. How could this terrifying event happen? Have NASA scientists discovered an asteroid that's been converted into a spacecraft? What are the strange objects spotted when NASA sends a top-secret payload into space?

Source: The SCIENCE Channel

Could NASA really be responsible for a nuclear explosion on Jupiter? Could new evidence finally reveal the truth behind the mystery of the iconic face on Mars? What unknown force crashed a spacecraft from the Apollo program into the lunar surface?

Source: The SCIENCE Channel

A Russian probe discovers something has disturbed the lunar soil before the US or the USSR got there. Did Nazis get there first? Have scientists detected a laser signal from a planet capable of supporting life? Is there really a Bermuda Triangle of Space?

Source: The SCIENCE Channel

The show takes a look at how the comet of the century looks like an alien spacecraft.

Something in space is attacking the brains of our astronauts. What is it? Should NASA be worried about the sudden appearance of so-called space fireflies? Who could be responsible for the bizarre glowing spiral in the skies over Norway?

Source: Science Channel