Chapter 1 - How is Earth moving in our solar system? Earth...

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Supercluster: A gigantic region of space where many individual galaxies and many groups and clusters of galaxies are packed more closely together than elsewhere in the universe. Observable Universe: The portion of the entire universe that can bee seen from earth. Astronomical Unit: Or AU, it is the average distance between Earth and the Sun, which is about 150 million kilometers Light Year: The distance that light can travel in one year, which is about 9.46 trillion kilometers. How far away are the stars? Nearest stars are about thousand of kilometers away.
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Unformatted text preview: How is Earth moving in our solar system? Earth rotates on its axis once each day and orbits the sun once each year. Earth orbits at a average distance from the sun of 1 Au and with an axis tilt of 23.5 to a line perpendicular to the ecliptic plane. How do galaxies more within the universe? Galaxies move at random with the local group, but all galaxies beyond the local group are moving away from us. More distant galaxies are moving faster, which tell us that this universe is expanding....
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