The History Channel

Gravity is the most powerful and exacting force in the universe. It is pervasive and penetrating. Gravity binds us together, its reach hangs stars in the sky and its grip crushes light. Gravity holds planets together, and leashes them to their suns. Without gravity, stars, comets, moons, nebulae, and even the Earth itself would not exist. Explore how science and humanity discovered, overcame and utilized gravity. Learn what it takes to propel objects into the heavens, to ride a wave or to ski down a slope. Take a front row seat as an astronaut subjects himself to the weightless wonders of the specially modified aircraft used to train astronauts known as the "Vomit Comet."

In this episode, our cast uses awesome analogies to bring the biggest objects, farthest distances and fastest speeds down to earth. To truly understand the scale of the cosmos, we jump behind the wheel of monster trucks, scale the Golden Gate bridge, and race across the desert in a rocket-powered car.

There really are ice worlds like Hoth from Star Wars. In this episode, we explore icy planets and moons, discover the role of cold in the Universe, and learn about the importance of ice to the development of habitable worlds.

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 telescopes and optical telescopes to scan the stars for signals. NASA is planning missions to Mars, Jupiter's sixth moon, Europa, and Saturn's largest moon, Titan, to look for primitive, microbial life in ice concentrations. Whether we discover primitive or intelligent life, how will that knowledge impact humankind's view of itself? Cutting-edge computer graphics are used to bring the universe down to earth to show what life would be like on other planets, and to imagine what kind of life forms might evolve in alien atmospheres.

Ignited by the power of the atom, burning with light, heat and wrath, stars are anything but peaceful. They collide, devour each other, and explode in enormous supernovas--the biggest explosions in the Universe. Using cutting-edge computer graphics, never-before-seen satellite images, and interviews with the world's leading astronomers, take a front row seat to the most amazing light show in the cosmos.

It has been fifty years since man first ventured into space, but the greatest secrets are yet to be revealed. Mars is the planet in our solar system most similar to Earth despite otherworldly features such as the largest volcano in the Solar System. Rumors of life on Mars may be substantiated as NASA orbiters and rovers discover new evidence of frozen water just beneath the rusty soil. Did alien life exist there? As Earth reels with the effects of global warming, Mars becomes the most likely candidate for eventual human habitation. Cutting-edge computer graphics are used to show what life would be like on Mars, and to imagine what kind of life forms might evolve in alien atmospheres.

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? And do eyewitness reports of UFO sightings jibe with modern theories of how interstellar travel might be possible? Authors, astronomers and theoretical physicists weigh in with the blueprints for inertia-canceling devices, nuclear-powered craft, antimatter propulsion systems and even warp drives. Based on Einstein's theories and countless scientific studies, we'll find out how these visitors might bridge the vast distances between the stars. And if they could survive such hazardous journeys, are they flesh and blood or intelligent machines?

Delve into the myths, misconceptions, truths and amazing mysteries of our unique universe. Could life exist on Mars? Is time travel possible and does Einstein's theory of relativity support it? Is there a companion dark star to our sun and could it pose a threat to earth? Learn about the spark that lit the big bang. Take a journey from science fiction that predicted all these things, to the scientific reality of what they mean to us in the ever-changing universe.

Don't try this at home! In this episode, our experts cook up ten ways you could destroy the earth, including: swallowing it with a microscopic black hole; blowing it up with anti-matter; hurling it into the Sun, and switching off gravity. This is a fun way to explore the dangerous physics of the Universe and the properties of the planet we call home.

Is it possible that sightings of alien beings or UFOs may actually be evidence of time travelers from the future? And might ancient astronauts actually be time travelers from our future? Scientists explore the theoretical possibility of time travel. How can it be achieved? And what might people from 10,000 years in the future look like?

Myths and legends have long been regarded as fantastic stories that describe powerful gods, mutant giants and fearsome monsters. But why do so many different cultures, separated by vast distances, tell the same stories? Is it possible that myths and legends were really eyewitness accounts of ancient astronauts descending to Earth? Ancient texts are filled with stories of gods interacting with humans, offering wisdom, technology, and even impregnating women. Could the demigods of mythology have been the offspring of alien and human unions? If so, could aliens have supplied the Missing Link that accelerated human evolution, advancing our civilization and making us who we are today?

First see a demolition team preparing to sink a barge to create an artificial reef--they stay onboard while detonating and are sent flying! Next a small plane carrying a grandfather and grandson is on fire on the runway and then the oxygen tanks explode. Watch as the Iranian embassy in London, being held by terrorists, is stormed by the SAS. Then parents in Atlanta witness the absolute horror of their children's nursery school explode a target of the infamous bomber Eric Rudolf. Finally a motorcycle race through the streets on the Isle of Man ends in a spectacular crash--see footage from three angles, including two pov cams.

Informational programming.

Informational programming.

Informational programming.

Informational programming.

The mysterious death of King Tut continues to puzzle archaeologists and scholars alike. From the moment the "Boy King's" mummy was discovered in the Valley of the Kings, rumors of foul play emerged. Recent x-ray's of King Tut's mummy show signs of a possible attack, but new evidence may point to another cause of death. In his quest for the truth, host Josh Bernstein climbs into King Tut's tomb, fires the weapons King Tut took to his grave, and uses modern science to dig deeper into the rumors of King Tut's murder.

Constructed as tombs for the ancient pharaohs, over 100 pyramids remain in Egypt. Built during a span of well over 1,000 years, they stand as cultural and engineering marvels of staggering proportions. But many things about these monuments, including the exact methods used to construct them, remain tantalizingly obscure. Travel back in time as we investigate their evolution--from the earlier mastaba to the Step Pyramid, Bent Pyramid, and of course, the magnificent necropolis at Giza.

It's 1000 BC and the Israelites are battling the Philistines. After wresting control of the throne of Israel in a bloody civil war, David moves quickly to destroy those who challenge his right to the throne, and then turns his sword on his political enemies. Finally, David sets his sites on a new target--the beautiful Bathsheba, but she is already married. For someone like David this is a minor impediment. He sends her husband to his death in battle, a battle that eventually propels Israel into becoming an empire.

Hannibal's merciless attacks on Roman soil dealt a near fatal blow to the soon-to-be Empire. Sworn by his father to a blood oath against the Romans, Hannibal of Carthage does the unthinkable... he marches 40 war elephants and a massive army over the Alps to gain an element of surprise. In three key battles--Hannibal uses terrain, intimidation and his iron will to annihilate the Roman Legions, killing every Roman soldier that he possibly can.

At 7:15AM on June 30, 1908, a giant fireball, as bright the Sun, explodes in the Siberian sky with a force a thousand times greater than the Hiroshima bomb. It decimates 1,000 square miles of forest--over half the size of Rhode Island, and was the biggest cosmic disaster in the history of civilization. What caused the apocalyptic fire in the sky? Over a hundred theories surround what is called the Tunguska event, varying from asteroids and comets to black holes and alien spaceships. Most scientists agree the Tunguska event will happen again, and next time, the human toll could be unimaginable. Now, NASA and other organizations race against time to stop the next planet killer before it ignites Armageddon.