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AST101H1 Midterm: Midterm #1 Study Guide!!! This is a must download, very DETAILED!

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School
UTSG
Department
Astronomy & Astrophysics
Course
AST101H1
Professor
Clifford Orwin

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AST101H1 Full Course Notes
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AST101H1 Full Course Notes
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Document Summary

Milky way used both as the name of our galaxy and to refer to the band of light we see in the sky when we look into the plane of the milky way galaxy. Galaxy a huge collection of anywhere from a few hundred million to more than a trillion stars, all bound together by gravity. Local group the group of more than 30 galaxies to which the milky way galaxy belongs. Galaxy clusters (cluster of galaxies) a collection of a few dozen or more galaxies bound together by gravity; smaller collections of galaxies are simply called groups (groups of galaxies with more than a few dozen members) Superclusters consists of many clusters of galaxies, groups of galaxies, and individual galaxies and are the largest known structures in the universe. Local supercluster the supercluster of galaxies to which the local group. Universe the sum total of all energy and matter. Big bang the event that gave birth to the universe.

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Related Questions

Which of the following correctly lists our "cosmic address" fromsmall to large?

a.) Earth, solar system, Milky Way Galaxy, Local Group, LocalSupercluster, universe

b.) Earth, solar system, Local Group, Local Supercluster, Milky WayGalaxy, universe

c.) Earth, Milky Way Galaxy, solar system, Local Group, LocalSupercluster, universe

The great astronomer Edwin Hubble discovered that all distant galaxies are receding from our Milky Way Galaxy with velocities proportional to their distances. It appears to an observer on the Earth that we are at the center of an expanding universe. Figure 3.64 illustrates this for five galaxies lying along a straight line, with the Milky Way Galaxy at the center. Using the data from the figure, calculate the velocities: (a) relative to galaxy 2 and (b) relative to galaxy 5. The results mean that observers on all galaxies will see themselves at the center of the expanding universe, and they would likely be aware of relative velocities, concluding that it is not possible to locate the center of expansion with the given information.

Figure 3.64 Five galaxies on a straight line, showing their distances and velocities relative to the Milky Way (MW) Galaxy. The distances are in millions of light-years (Mly), where a light-year is the distance light travels in one year. The velocities are nearly proportional to the distances. The sizes of the galaxies are greatly exaggerated; an average galaxy is about 0.1 MlY across.

The great astronomer Edwin Hubble discovered that all distant galaxies are receding from our Milky Way Galaxy with velocities proportional to their distances. It appears to an observer on the Earth that we are at the center of an expanding universe. The figure illustrates this for five galaxies lying along a straight line, with the Milky Way Galaxy at the center. Using the data from the figure, calculate the velocities:

(a) relative to galaxy 2 and

(b) relative to galaxy 5.

The results mean that observers on all galaxies will see themselves at the center of the expanding universe, and they would likely be aware of relative velocities, concluding that it is not possible to locate the center of expansion with the given information.