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AST101H1 Midterm: MIDTERM STUDY NOTES (KEY CONCEPTS)

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School
UTSG
Department
Astronomy & Astrophysics
Course
AST101H1
Professor
Michael Reid

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AST101H1 Full Course Notes
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AST101H1 Full Course Notes
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Document Summary

Because the light that we see from distance stars/galaxies took time to reach us. This is also the distance between the sun to the earth y earth s orbital path is called ecliptic. Which means that it s not a perfect circle around the sun, but rather, is closer at one point than another. y earth s axis is tilted 23. 5 degrees from a line perpendicular to the ecliptic plane. The tilt is orientated so that it points directly to the star polaris or the north star. y milky way is also rotating y galaxy s have more mass than what is seen. However, it is also comprised of dark matter (no light comes from it) Chap 2 y constellation is a region of the sky with sell defined borders. There are 88 official constellations y the celestial sphere: stars in a particular constellation appear to lie close to one another but may be quit far apart in reality.

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Related Questions

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.

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. 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.