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ASTR 121 > ASTO Final Exam > Flashcards

ASTO Final Exam Flashcards

1
Q

What type of light we use to see the center of the Milky Way?

A

X-ray, Infrared, and radio waves are the best to look into the milky way.

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2
Q

What can you see when viewing X-ray?

A

Only the more extreme objects.(white dwarfs, neutron stars, and stellar-mass black holes)

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3
Q

What is a globular cluster?

A

clusters that
form so many stars that they are
gravitationally bound even after the
gas is depleted.

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4
Q

What’s bound to happen to the satellite galaxy orbiting the Milky way.

A

They get ripped apart by tidal forces.

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5
Q

How are large galaxies formed.

A

They are formed through Galaxy mergers.

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6
Q

What does a elliptical galaxy look like?

A

Elliptical galaxies are galaxies that have no
disk and appear as spheroids or overloids. With little gas.

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7
Q

With the hubble constant what is the milky way.

A

The milky way is a SBa or a SBb (spiral barr)

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8
Q

What makes an irregular galaxy?

A

Galaxy merging causes these weird galaxies.

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9
Q

What piece of evidence show we have dark matter.

A

Bullet clusters

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10
Q

What does mass to light ratio measure.

A

how much more a
galaxy weighs than the amount of light it
produces.

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11
Q

What is dark matter mass to light ratio?

A

0

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12
Q

What type of galaxy has the old stars.

A

elliptical

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13
Q

What type of galaxy has the highest mass?

A

Spiral galaxies

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14
Q

What galaxy has the biggest diameter?

A

Spiral galaxies

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15
Q

How do we measure distant galaxies?

A

By calculating its red shift.

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16
Q

What spectrum is used to measure the redshift?

A

Redshifts are determined by
looking at common absorption
lines in the spectrum.

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17
Q

Z=v/c What are these

A

Z = redshift
c= speed of light
v= radial velocity

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18
Q

Why are galaxies moving
away from us?

A

Because the universe is expanding.

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19
Q

What percentage of the universe is Dark matter?

A

27%

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20
Q

What percentage of the universe is ordinary matter?

A

5%

21
Q

What percentage of the universe is Dark energy?

A

68%

22
Q

What percentage of the universe is stars?

A

<1%

23
Q

What was the cause of the universe.

A

The big bang

24
Q

What does dark energy do to the universe?

A

Makes the universe expand faster.

25
Q

What is the Hubble constant today?

A

68 km/s/Mpc

26
Q

What is the thought of dark energy?

A

The best guess is that dark energy is has a
constant density in the Universe over time.

27
Q

What will happen to the universe if matter dominates?

A

the universe will collapse.

28
Q

What will happen to the universe if dark matter dominates?

A

The universe will expand infinitely fast.

29
Q

At the beginning of the universe why weren’t photons and electrons formed.

A

because the temperature was to hot.

30
Q

What allowed photons and electrons to form?

A

As the universe expands it cooled. within a few second they were able to form.

31
Q

What happens to a free neutron?

A

Because it is unstable it decays into a proton.

32
Q

What happened to electrons as the universe cooled?

A

The moment the
Universe cooled enough
for electrons to join
protons and form atoms,
all the trapped light
escaped.

33
Q

What is the CMB?

A

Cosmic Microwave Background

34
Q

What is inflation?

A

that the
Universe started small and then
expanded very fast.

35
Q

What is a peak in the universe?

A

These are over dense areas that get smaller and more dense.

36
Q

What are voids in the universe?

A

These are areas that expand and get even less dense.

37
Q

What is the Dark age of the universe?

A

The period between the CMB light and the first star is
called the Dark Age of the Universe and cannot be
observed.

38
Q

What is the Reionization era.

A

matter was ionized before recombination.

39
Q

What is Photoevaporation?

A

where
light adds enough heat or
momentum to cause atoms to
escape a gravity well of a galaxy.

40
Q

What happens to a galaxy after photoevaporation.

A

Galaxies fail to form stars for a long time, if ever.

41
Q

what is the cosmic noon.

A

this was the peak of star formation in the universe.

42
Q

What is the cosmic dawn.

A

This is the start of star formation at the start of reionization.

43
Q

What makes most of the Milky ways mass.

A

Dark matter halo

44
Q

What is the largest local cluster?

A

The Virgo cluster

45
Q

Super cluster

A

The Virgo supercluster

46
Q

An even larger super cluster?

A

The Laniakea that contains four superclusters.

47
Q

What is the single point in the Laniakea Supercluster are all attracted to?

A

The great Attractor/

48
Q
A

ASTR 121 (7 decks)

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