Without the moon, humans wouldn't exist. Life, if it had started at all, would be in its earliest stages of evolution. Days would last four hours, winds would blow at hurricane force and there would be a dense and toxic atmosphere resembling that of Venus. Around 50 million years after the formation of the solar system, a Mars-sized planet called Theia hit the newly formed Proto-Earth. The blast sent planetary material from the pair into orbit around earth which eventually formed the Moon. In this one-hour special, viewers learn what Earth was like before the moon creating impact, and what Earth would have been like if the moon had never existed.

A documentary on Al Gore's campaign to make the issue of global warming a recognized problem worldwi...

The Earth Wins explores the delicate balance between man and Mother Earth, our inter-dependence and ...

The first American space station Skylab is found in pieces scattered in Western Australia. Putting t...

In the year 1957 the cold war expands to space. The Soviet-Union sends Sputnik as the first manmade ...

Investigates the greatest vanishing act in the history of our planet - the sudden disappearance of t...

An experience of a camera swinging in different gestures facing the optical distortion of the Sun. T...

William Shatner presents a light-hearted look at how the "Star Trek" TV series have influenced and i...

A new age of space exploration, and exploitation, is dawning. But surprisingly, some of the boldest ...

Horizon visits state-of-the-art laboratories and uses CGI to recreate the science-fiction-worthy wea...

NASA may have just gotten one step closer to the answering the question: are we alone? The Spitzer T...

In one single, epic camera move we journey from Earth's surface to the outermost reaches of the univ...

Roddy McDowall takes you, film by film, from production meetings to make-up sessions, then right ont...

An epic journey around Mars — built from real satellite and rover data — revealing the red planet as...
Comets pose one of the greatest threats to life on Earth - a threat that can only be countered if we...

Travel alongside the astronauts as they deploy and repair the Hubble Space Telescope, soar above Ven...

Join the Mars rovers Spirit and Opportunity for an awe-inspiring journey to the surface of the myste...

Some 220 miles above Earth lies the International Space Station, a one-of-a-kind outer space laborat...

National Geographic and NASA are sending you into space - live! For the first time ever, board the I...

Archival material from the original NASA film footage – much of it seen for the first time – plus in...

From the unique vantage point of 200 miles above Earth's surface, we see how natural forces - volcan...