NATS 1880 Lecture Notes - Lecture 3: Interstellar Cloud, Oort Cloud, Gravitational Energy
13 Dec 2016
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Life beyond earth: chapter 3, the universal context of. In that case, it is reasonable to think that the same processes that made life possible on earth is to have also made life possible on other worlds. 3. 2 the structure, scale and history of the universe. Each planet in our solar system consists of the sun and all objects that orbit it including moons and smaller objects including comets and asteroids. A galaxy is a great island of stars in space, containing from a few hundred million to a trillion or more stars, all held together by gravity. Groups of galaxies with more than a few dozen members are often called galaxy clusters. Light year: distant life can travel in one year, 300,000 km per second (distance = speed x time) Dark energy: pushing galaxies apart even while their gravity tries to draw them together.
