AST101H1 Chapter Notes - Chapter 1: Interstellar Travel, Observable Universe, Virgo Supercluster
17 Sep 2016
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AST101H1 Full Course Notes
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Earth is a planet in our solar system, which consists of the sun, the planets and their moons, and countless smaller objects, such as comets and asteroids. Our solar system belongs to the huge, disc-shaped (cid:272)olle(cid:272)tio(cid:374) of sta(cid:396)s (cid:272)alled the (cid:862)milk(cid:455) wa(cid:455) Gala(cid:454)(cid:455)(cid:863: a galaxy is a great island of stars in space, containing between a few hundred million and a trillion or more stars, the milky way galaxy is a relatively large galaxy, containing more than 100 billion stars. Billions of other galaxies are scattered throughout space. Some galaxies are fairly isolated, but many others are found in groups: our milky way, for example, is one of the two largest among about 40 galaxies in the. Local group: groups of galaxies with more than a few dozen members are called galaxy clusters. Together, all these structures make up our universe.
