Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

Astronomy > galaxies > Flashcards

galaxies Flashcards

4/9/24

1
Q

a collection of dust, gas, and billions of stars bound together by their mutual gravitational attraction

A

galaxy

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q
  • very little interstellar dust and gas
  • little star formation
  • subdivided by the galaxy’s roundness
A

elliptical galaxies “E”

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q
  • central bulge with arms
  • active star formation
  • subdivided by size of central bulge and how tightly wrapped the arms are
A

spiral galaxies “S”

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q
  • central bulge is stretched out to form a bar shape in the center
  • active star formation
  • subdivided by size of central bulge and how tightly wrapped the arms are
A

barred spiral galaxies “SB”

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q
  • disk galaxy with no arms
  • between elliptical and spiral galaxies
  • very little star formation
A

lenticular galaxies

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q
  • very rich in dust and gas
  • has star formation
  • no real shape
A

irregular galaxies

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q
  • unusual shape, size, and composition
  • interacting galaxies or active galactic nuclei
  • colliding galaxies resulting in starburst areas (rapid star formation)
A

peculiar galaxies

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

a) youngest star(our sun)
b) high metallicity
c) formed from nebulae that were rich in heavy elements

A

Population I Stars

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

a) middle aged stars
b) intermediate metallicity
c) formed from the gas and dust released by dying population III stars

A

Population II Stars

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

a) oldest stars(came first)
b) low metallicity
c) formed from hydrogen and helium in the early universe

A

Population III Stars

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

clusters of galaxies held together by gravitational force and dark matter

A

Galaxy clusters

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

1,000 or more galaxies

A

Rich clusters

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

few dozen to 100 galaxies

A

poor clusters

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

almost spherical shape with a central concentration of galaxies

A

regular clusters

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

random or asymmetrical distribution of galaxies

A

irregular clusters

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q
  • area of galaxy clusters
  • held together by some gravitational force but mostly DARK MATTER
A

superclusters

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q
  • largest supercluster found so far
  • 520 million light years in diameter
  • astronomers have found 8,000+ galaxies surrounding the milky way
A

laniakea supercluster

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q
  • center of laniakea supercluster
  • creates a gravitational anomaly due to other superclusters moving towards the great attractor rather than away from it
A

great attractor

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
19
Q

what’s our cosmic address?

A

1) Earth
2) Solar System
3) Interstellar Neighborhood
4) Milky Way Galaxy
5) Local Galactic Group
6) Virgo Supercluster
7) Local Supercluster Laniakea Supercluster
8) Observable Universe

20
Q

what galaxy do we live in?

A

milky way

21
Q

Suppose a radio telescope is pointed towards our nearest galactic neighbor, the Andromeda Galaxy. Describe
how we could turn this data into an image that we can see with our eyes?

A

Use radio data to create a false-color image

22
Q

A Cepheid variable is a type of star that is used to measure distances. What did Hubble discover using this type
of star?

A

Discovered that the universe is expanding and that tgere are other individual galaxies

23
Q

The most common system for categorizing galaxies categorizes them by their ________________, was developed
by _______________________________ and is sometimes called “Hubble’s ___________________________”.

A

shape
hubble
Hubble’s tuning fork diagram

24
Q

Do galaxy mergers happen very often?

A

yes

25
Q

Has the Milky Way ever merged with other galaxies?

A

yes

26
Q

Is it likely that the Milky Way will merge with any galaxies in the future?

A

yes

27
Q

Will the stars in the Milky Way galaxy ever burn out?

A

yes

28
Q

Describe these subgroups of ELLIPTICAL galaxies:

  • e0
A

perfectly spherical

29
Q

Describe these subgroups of ELLIPTICAL galaxies:

  • e3
A

flattened and elongated

30
Q

Describe these subgroups of ELLIPTICAL galaxies:

  • e7
A

very elongated and cigar-shaped

31
Q

Describe these subgroups of SPIRAL galaxies:

*Sa

A

large central bulge, tightly wound arms

32
Q

Describe these subgroups of SPIRAL galaxies:

*Sb

A

medium central bulge, moderately wound arms

33
Q

Describe these subgroups of SPIRAL galaxies:

*Sc

A

small central bulge, loosely wound arms

34
Q

Describe these subgroups of BARRED SPIRAL galaxies:

*SBa

A

large central bar, tightly wound arms

35
Q

Describe these subgroups of BARRED SPIRAL galaxies:

*SBb

A

medium central bar, moderately wound arms

36
Q

Describe these subgroups of BARRED SPIRAL galaxies:

*SBc

A

small central bar, loosely wound arms

37
Q

What is the name of the galaxy cluster that the Milky Way is in?

A

local group

38
Q

Our galaxy is ______________________ly across by _____________________ ly thick.

A

100,000 ly across
2,000 ly thick

39
Q

How many stars does our galaxy contain?

A

300 billion

40
Q

The center of our galaxy is a galactic _______________ which contains a _________________ called
_____________________, and also ____________________ of stars

A

center: galactic nucleus
contains: supermassive black hole and
millions of stars

41
Q

Surrounding the nucleus of our galaxy is a flattened sphere of stars called the

A

central/galactic bulge

42
Q

What is the name of the Milky Way arm our Sun is located in?

A

orion arm

43
Q

The ______________ extends in a sphere around our galaxy and contains dark ___________________

A

halo

dark

44
Q

Where in our galaxy are we located?

A

the outer edge

45
Q

What is Milkdromeda?

A

the collision of the galaxies the Milky Way and Andromeda

Astronomy (5 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions