In a galaxy filled with a billion stars, in a universe filled with a hundred billion galaxies--are we alone? SETI--the Search for Extraterrestrial Intelligence--is a privately funded project using radio and optical telescopes to scan the stars.

Many argue that flying saucers and other extra-terrestrial space ships continuously visit the earth. If that were true, what kinds of technologies would such alien spacecraft require?

They soar through the heavens, fly through the oceans, and glide along land. But these are not creatures found on a wildlife safari. These are life forms from another planet.

What does the Universe sound like? From the sweep of a pulsar, to the deafening roar of our boiling sun this episode explores the undiscovered soundscapes of the solar system, the galaxy, and the entire cosmos. And, is it true that in space nobody can hear you scream?!? Our scientists reveal that there are places in the Universe that prove this sci-fi statement wrong.

Have planet hunters finally found proof of other Earthlike worlds? Astronomers have now discovered over two hundred alien worlds, beyond our solar system, that were unknown just a decade ago. Discover planets that rage with fiery hurricanes and bizarre planets covered by water so dense that it forms a kind of hot ice. Among these weird worlds, Earth actually seems like the oddball with the right conditions for life.

To know our place in the universe take a look far, far away to the realm of Alien Galaxies. Our galaxy is one of hundreds of billions in the universe. The Milky Way consists of more than a billion stars, our sun being only one of them.

Travel from the inner solar system to the Kuiper Belt and explore the moons surrounding the planets of the solar system. Many of these moons that were once unknown are now on the cutting edge of astronomical study.

In the last few years, the Red Planet has yielded up many new clues that life may have once existed there...and may even exist there today. There is now have proof that water once flowed on the surface, that Mars once had lakes, and that the frozen poles are mostly water, not carbon dioxide as previously thought. Mars has snow--an aurora--and lightning generated by dust storms. Most intriguing of all are the seasonal plumes of methane that just may point to bacteria living below the surface.

In a galaxy filled with a billion stars, in a universe filled with a hundred billion galaxies--are we alone? SETI--the Search for Extraterrestrial Intelligence--is a privately funded project using radio and optical telescopes to scan the stars.

Many argue that flying saucers and other extra-terrestrial space ships continuously visit the earth. If that were true, what kinds of technologies would such alien spacecraft require?

They soar through the heavens, fly through the oceans, and glide along land. But these are not creatures found on a wildlife safari. These are life forms from another planet.

What does the Universe sound like? From the sweep of a pulsar, to the deafening roar of our boiling sun this episode explores the undiscovered soundscapes of the solar system, the galaxy, and the entire cosmos. And, is it true that in space nobody can hear you scream?!? Our scientists reveal that there are places in the Universe that prove this sci-fi statement wrong.

Have planet hunters finally found proof of other Earthlike worlds? Astronomers have now discovered over two hundred alien worlds, beyond our solar system, that were unknown just a decade ago. Discover planets that rage with fiery hurricanes and bizarre planets covered by water so dense that it forms a kind of hot ice. Among these weird worlds, Earth actually seems like the oddball with the right conditions for life.

To know our place in the universe take a look far, far away to the realm of Alien Galaxies. Our galaxy is one of hundreds of billions in the universe. The Milky Way consists of more than a billion stars, our sun being only one of them.

Travel from the inner solar system to the Kuiper Belt and explore the moons surrounding the planets of the solar system. Many of these moons that were once unknown are now on the cutting edge of astronomical study.

In the last few years, the Red Planet has yielded up many new clues that life may have once existed there...and may even exist there today. There is now have proof that water once flowed on the surface, that Mars once had lakes, and that the frozen poles are mostly water, not carbon dioxide as previously thought. Mars has snow--an aurora--and lightning generated by dust storms. Most intriguing of all are the seasonal plumes of methane that just may point to bacteria living below the surface.

In a galaxy filled with a billion stars, in a universe filled with a hundred billion galaxies--are we alone? SETI--the Search for Extraterrestrial Intelligence--is a privately funded project using radio and optical telescopes to scan the stars.

Many argue that flying saucers and other extra-terrestrial space ships continuously visit the earth. If that were true, what kinds of technologies would such alien spacecraft require?

They soar through the heavens, fly through the oceans, and glide along land. But these are not creatures found on a wildlife safari. These are life forms from another planet.

What does the Universe sound like? From the sweep of a pulsar, to the deafening roar of our boiling sun this episode explores the undiscovered soundscapes of the solar system, the galaxy, and the entire cosmos. And, is it true that in space nobody can hear you scream?!? Our scientists reveal that there are places in the Universe that prove this sci-fi statement wrong.

Have planet hunters finally found proof of other Earthlike worlds? Astronomers have now discovered over two hundred alien worlds, beyond our solar system, that were unknown just a decade ago. Discover planets that rage with fiery hurricanes and bizarre planets covered by water so dense that it forms a kind of hot ice. Among these weird worlds, Earth actually seems like the oddball with the right conditions for life.

To know our place in the universe take a look far, far away to the realm of Alien Galaxies. Our galaxy is one of hundreds of billions in the universe. The Milky Way consists of more than a billion stars, our sun being only one of them.

Travel from the inner solar system to the Kuiper Belt and explore the moons surrounding the planets of the solar system. Many of these moons that were once unknown are now on the cutting edge of astronomical study.

In the last few years, the Red Planet has yielded up many new clues that life may have once existed there...and may even exist there today. There is now have proof that water once flowed on the surface, that Mars once had lakes, and that the frozen poles are mostly water, not carbon dioxide as previously thought. Mars has snow--an aurora--and lightning generated by dust storms. Most intriguing of all are the seasonal plumes of methane that just may point to bacteria living below the surface.