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Astronomy > Final ch 14-18 > Flashcards

Final ch 14-18 Flashcards

1
Q

What is the approximate number of stars in the Milky Way galaxy.

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2
Q

What part of the Galaxy we are viewing when seeing the Milky Way at night.

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3
Q

Which major galaxy is closest to the Milky Way galaxy.

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4
Q

How does the Milky Way galaxy compares to its structure.

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5
Q

What object is believed to be located at the center of the Milky Way galaxy.

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6
Q

What is the name of the astronomer that tried to estimate the Milky Way galaxy’s size by counting stars. Know why his method failed.

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7
Q

What are the characteristics of Cepheid and RR Lyrae variable stars.

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8
Q

What is the main use of the Period-Luminosity relationship.

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9
Q

What is the width of the Milky Way galaxy.

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10
Q

Who was the astronomer that classified the 4 types of galaxies.

Know that the Milky Way is a barred spiral galaxy.

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11
Q

What are the characteristics of each of the 4 types of galaxies

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12
Q

What are the characteristics and age of stars in the disk, bulge, and halo.

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13
Q

How was the Milky Way galaxy formed.

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14
Q

What is the length of time of a Galactic year.

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15
Q

What are the two theories that explain how spiral arms maintain themselves in a spiral galaxy.

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16
Q

What makes up most of the mass in the Milky Way galaxy.

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17
Q

What are the leading candidates for explaining the composition of dark matter.

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18
Q

how can gravitational lensing be used to detect dark matter.

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19
Q

Know how Large and Small Magellanic Clouds are classified.

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20
Q

How is Hubble’s “tuning fork” used.

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21
Q

How does Sa, Sb, and Sc classifications differ in spiral galaxies.

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22
Q

what are standard candles

and how they are used

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23
Q

How is the Tully-Fisher relation is used to find distance to a galaxy.

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24
Q

How are the Large and Small Magellanic Clouds classified.

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25
Q

How is Hubble’s “tuning fork” is used.

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26
Q

What are the two theories that explain how spiral arms maintain themselves in a spiral galaxy.

A

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27
Q

What are the cluster of galaxies containing Andromeda and the Milky Way.

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28
Q

What determines whether a galaxy is active or not.

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29
Q

What is Hubble’s Law and how it is used.

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30
Q

What is the likely source of energy for active galaxies.

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31
Q

which two galaxy types combine to form lenticular galaxies.

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32
Q

What are they the different types of active galaxies and their characteristics.

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33
Q

What type of active galaxy is the brightest and most distant.

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34
Q

What is the approximate percentage of dark matter in the Universe.

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35
Q

Are collisions between galaxies frequent and can they trigger star formation.

A

Yes

36
Q

What happens to individual stars associated with colliding galaxies.

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37
Q

which galaxy is destined to collide with the Milky Way.

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38
Q

What are the steps in the evolution of galaxies.

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39
Q

What type of galaxies that are the most distant as seen in the Hubble Deep Field.

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40
Q

What is meant by “Galactic cannibalism”?

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41
Q

How do spiral galaxies turn into elliptical galaxies.

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42
Q

What is the theory on how Supermassive Black Holes formed.

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43
Q

When the Quasar Epoch occur.

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44
Q

Does Dan love sun chips.

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45
Q

Which supercluster of galaxies contain the Milky Way.

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46
Q

how are galaxies arranged on the largest scale.

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47
Q

what are Voids?

What is the Great Wall

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48
Q

How is an Einstein Cross formed

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49
Q

what does it mean when we say the Universe is homogenous and isotropic.

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50
Q

What is the Cosmological Principle.

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51
Q

Most galaxies are redshifted because the Universe is expanding.

A

True

52
Q

What is the approximate age of the Universe.

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53
Q

What is the Big Bang Theory

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54
Q

What factor of the Universe will determine whether it will expand forever or collapse.

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55
Q

What is the difference between an open, closed, and flat Universe and which one most Cosmologists believe ours to be.

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56
Q

What is the mysterious force believed to cause the Universe’s expansion to be accelerating.

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57
Q

What is the cause of the Cosmic Microwave Background and what is its current temperature.

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58
Q

how did normal and dark matter interact in the formation of the early Universe.

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59
Q

How is life defined?

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60
Q

what did the Miller and Urey experiment produce?

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61
Q

when did one-celled and multi-celled organisms appeare on Earth.

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62
Q

what element is common to organic molecules.

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63
Q

You are super great. I am so proud of you babe. Keep going!!

A

Yes you are.

64
Q

What type of life could potentially exist in Europa’s oceans underneath its icy shell or on Titan.

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65
Q

What monitors radio waves in its search for life elsewhere in the Universe.

A

SETI

66
Q

SETI monitors (??????) in its search for life elsewhere in the Universe.

A

Radio waves

67
Q

What is the purpose of the Drake Equation.

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68
Q

how long has our civilization been technological according to the parameters set forth by the Drake Equation.

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69
Q

Based on the assumptions made in the Drake Equation,

What is the expected number of technological civilizations in the Milky Way galaxy.

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70
Q

What is the significance of the “Water Hole” and the habitable zone.

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Astronomy (1 decks)

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