Astronomy, Space

Broadcast 2009. Black Holes are one of the most destructive forces in the universe, capable of tearing a planet apart and swallowing an entire star. Yet scientists now believe they could hold the key to answering the ultimate question - what was there before the Big Bang? The trouble is that researching them is next to impossible. Black holes are by definition invisible and there's no scientific theory able to explain them.

For two hours in July of 1969, the world stood still as man landed and walked on the moon. Tens of millions watched it happen, on blurry black and white television, beamed back a quarter million miles across the heavens. For the first time in human history, all mankind could observe a profound discovery as it happened.

Broadcast 2010. Famed for their ability to inflict Armageddon from outer space, asteroids are now revealing the secrets of how they are responsible for both life and death on our planet. Armed with an array of powerful telescopes, scientists are finding up to 3000 new asteroids every night. And some are heading our way. But astronomers have discovered that it's not the giant rocks that are the greatest danger - it's the small asteroids that pose a more immediate threat to Earth.

Discovery Channel documentary about the human mission to red planet. (www.youtube.com)

Astronomers are closing in on the proof they've sought for years that one of the most destructive objects in the universe—a supermassive black hole—lurks at the center of our own galaxy. Could it flare up and consume our entire galactic neighborhood? Join NOVA on a mind-bending investigation into one of the most bizarre corners of cosmological science: black hole research.

Responsible for unlocking many mysteries of the final frontier, the most renowned telescope in the world is in danger of being lost forever. The Hubble Space Telescope has explored the creation of stars and planets, the glory of supernovas and the formation of super massive black holes, charted dark matter and changed forever our understanding of reality itself. Now, it's spiraling toward the Earth, and astronauts are embarking on a dangerous mission to fix it.

Venture on an epic quest to discover the invisible forces and occurrences that sustain life on this planet and - for the first time - see these processes in action. (www.youtube.com)

The events that led to the formation of our solar system have for centuries been shrouded in mystery. Advances in astronomical technology have allowed scientists to uncover the truth behind the birth of our mighty solar system. (www.youtube.com)

We can't compare anything on earth to the biggest things known in space. The Lymann Alpha blob is a bubble like structure containing countless galaxies -- perhaps the biggest object in the entire universe.

Regions of radio-emitting gas called "radio lobes" could be even bigger. Then there are super galaxy clusters which are hundreds of galaxies merged together due to cosmic collisions.

Discover which is the largest planet, star, star cluster, constellation, black hole, volcano, galaxy, explosions, moon, storm, impact crater and "void" in space. (www.youtube.com)

A black hole is a region of spacetime whose gravitational field is so strong that nothing which enters it, not even light, can escape. The theory of general relativity predicts that a sufficiently compact mass will deform spacetime to form a black hole. Around a black hole there is a mathematically defined surface called an event horizon that marks the point of no return. It is called "black" because it absorbs all the light that hits the horizon, reflecting nothing, just like a perfect black body in thermodynamics.

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