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Life in The Universe (Documentary)
14 Most Beautiful Galaxies In the Universe!
A galaxy is a massive, gravitationally bound system consisting of stars, gas, dust, and dark matter. Galaxies can have as many of 100 trillion stars and there are more than 170 billion galaxies in the known universe.
National Geographic Live! - Solar System Exploration: 50 Years and Counting
The Birth Of The Moon
Our Moon was formed when Theia, a celestial body the size of Mars, collided with Earth 4.5 Billion years ago. The resulting debris formed our Moon