Review Chapter 2 Cosmic Perspective





4)When we look into the band of light in our sky that we call the Milky Way, can we see distant galaxies? Why or why not? 4) _______

A)Yes, there are many other galaxies that we see inside the Milky Way.

B)No, because there are only galaxies above and below the plane of the Milky Way.

C)No, we cannot see any other galaxies from Earth.

D)Yes, they appear as small, fuzzy patches on the other side of our galaxy.

E)No, because the stars, gas, and dust of the Milky Way block us from seeing them.



5)Which of the following statements about the celestial sphere is not true? 5) _______

A)When we look in the sky, the stars all appear to be located on the celestial sphere.

B)The earth is placed at the center of the celestial sphere.

C)The "celestial sphere" is just another name for our universe.

D)From any location on Earth, we can see only half the celestial sphere at any one time.

E)The celestial sphere does not exist physically.



6)Why do we see essentially the same face of the Moon at all times? 6) _______

A)because the Moon's rotational and orbital periods are equal

B)because the Moon has a nearly circular orbit around the earth

C)because the Moon does not rotate

D)because the Sun illuminates only one half at a time

E)because the other face points toward us only at new moon, when we can't see the Moon



9)What effect or effects would be most significant if the Moon's orbital plane were exactly the same as the ecliptic plane? 9) _______

A)Solar eclipses would be much rarer.

B)Solar eclipses would last much longer.

C)Solar eclipses would be much more frequent.

D)both A and C

E)both B and C



10)In addition to the conditions required for any solar eclipse, what must also be true in order for you to observe a total solar eclipse? 10) _______

A)The Moon's penumbra must touch the area where you are located.

B)The earth must lie completely within the Moon's penumbra.

C)The earth must lie completely within the Moon's umbra.

D)The earth must be near aphelion in its orbit of the Sun.

E)The Moon's umbra must touch the area where you are located.



11)Why is it summer in the Northern Hemisphere when it is winter in the Southern Hemisphere? 11) _______

A)The Northern Hemisphere is closer to the Sun than the Southern Hemisphere.

B)The Northern Hemisphere is tilted away from the Sun and receives more indirect sunlight.

C)The Northern Hemisphere is "on top" of the earth and therefore receives more sunlight.

D)The Northern Hemisphere is tilted toward the Sun and receives more direct sunlight.

E)It isn't: both hemispheres have the same seasons at the same time.



12)Which of the following is not a phase of the Moon? 12) _______

A)half moon

B)new moon

C)full moon

D)first-quarter moon

E)third-quarter moon


20)All of the following statements are true. Which one explains the reason why there is not a solar eclipse at every new moon? 20) _______

A)The Moon is the primary cause of tides on the earth.

B)The nodes of the Moon's orbit precess with an 18-year period.

C)The sidereal month is shorter than the lunar month.

D)The orbital plane of the Moon is tilted by about 5 to the ecliptic plane.

E)The Moon rotates synchronously with its revolution about the earth.



TRUE/FALSE. Write 'T' if the statement is true and 'F' if the statement is false.

21)The seasons on Earth are caused by its elliptical orbit around the Sun. 21) _______



22)The Moon and the Sun are approximately the same angular size. 22) _______



23)The Milky Way can be seen only from the Northern Hemisphere. 23) _______



24)You can find the tilt of the earth's axis by measuring the angle between your horizon and the North Star.