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The Universe

The  Galaxy Song

Monty Python's Meaning of Life, after this its more serious content.

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Planets, Stars, Nebulae, Galaxies - Universe Size Comparison

This is the ultimate size comparison video that you can find on the internet in HD. Starts with the tinyest dwarf planets of our solar system, then continues with large planets, dwarf stars, stars giant/supergiant/hypergiant stars, nebulae, globular clusters and galaxies. There is the famous VY Canis Majoris rated as the biggest star known, but very few know that that the incredible IC 1101 is the largest known object in the entire universe. Only galaxy clusters are bigger than it. Hope you enjoy this one.
-Sizes are not 100% accurate as there is no way to directly measure them.
-Star sizes may change in the future, and new stars may eventually appear into this biggest stars list
-Song: Celtic Panpipes - Ride on

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Extraterrestrial Life (Astrobiology, Possible Life On Europa, FeS Theory)

This presentation explains the scope of the search for ET and the problems that we face along the way. The search for life elsewhere in the universe is limited to our present understanding of life as we know it. Therefore we have set the requirements for ET based on what we know about Earth-life. We have begun to search for ET and our top priority is Europa. We have learned that Europa harbours a large body of liquid water underneath its ice. Scientists speculate that Europa has hydrothermal vents similar to Earth's. In 1977 a group of marine geologists discovered a seperate ecosystem around the hydrothermal vents along the galapagos rift - a projection of East Pacific Rise. Therefore the prospects for finding similar chemosynthetic ecosystem around the hydrothermal vents on Europa are very high.

Included in this video, I have explained in abstract form the iron sulfur world theory - which is the origins of life theory proposed by Gunter Wachtershauser. It proposes that early life originated near these hydrothermal vents. In contrast to classical Miller-Urey experiment which depend on the sunlight and UV-radiation, the wachtershauser system depends on the earth's geothermal energy and also the reducing potential of sulfides of iron and other transition metals. Wachtershauser postulated the emergence of pioneer organism which operated on a backward reducing version of the citric acid cycle.

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Brian Greene: The universe on a string

In clear, nontechnical language, string theorist Brian Greene explains how our understanding of the universe has evolved from Einstein's notions of gravity and space-time to superstring theory, where minuscule strands of energy vibrating in 11 dimensions create every particle and force in the universe. (This mind-bending theory may soon be put to the test at the Large Hadron Collider in Geneva.)

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David Deutsch: What is our place in the cosmos?

Legendary scientist David Deutsch puts theoretical physics on the back burner to discuss a more urgent matter: the survival of our species. The first step toward solving global warming, he says, is to admit that we have a problem.

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Sir Martin Rees: Earth in its final century?

In a taut soliloquy that takes us from the origins of the universe to the last days of a dying sun 6 billion years later, renowned cosmologist Sir Martin Rees explains why the 21st century is a pivotal moment in the history of humanity: the first time in history when we can materially change ourselves and our planet. Stunning imagery of cosmological wonders show us the universe as we know it now. Speaking as "a concerned member of the human race," Rees harkens to the wisdom of Einstein, calling for scientists to act as moral compasses, confronting the coming developments and ensuring our role in "the immense future."

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