How do astronomers believe an irregular galaxy forms?

They're regular galaxies distorted by gravity field of large nearby galaxy.

A neutron star theoretically will form from a supernovae collapse that ________.

compresses atoms so elec are so close to nucleus that prot convert to neut

The first stars formed about 300 million years after Big Bang in the most massive nebulae because

the massive nebulae had enough gravity to collapse and condense

Spiral galaxies tend to resemble a pinwheel because ________

stars in center of galaxy are moving faster than ones on the outer edges

What is a "main sequence star"?

a star that falls in a band on the H-R Diagram with most other stars

Evidence for the existence of dark matter includes the observation that ________

stars near the center of galaxies do not rotate as fast as expected

studbud

JCHS Earth/Space Science Chapter 24 Test Review

22 termsStudBud Administration80 plays

Beyon Our Solar System

Flashcards22 cardsFPractice quizPHost liveL

Questions 22

Answers

1
Point in stellar evolution when star has used up its fuel & is radiating away its remaining thermal energy as light is
white dwarf
main-sequence star
black hole
red giant
2
Which color stars have the coolest surface temperature?
red
yellow
orange
blue
3
How do astronomers believe an irregular galaxy forms?
They are young galaxies that have not yet developed a more regular form.
They are two or more galaxies that have not completed their merger.
Several regular galaxies of different sizes merge.
They're regular galaxies distorted by gravity field of large nearby galaxy.
4
A neutron star theoretically will form from a supernovae collapse that ________.
fuses all of the atoms into super atoms with very high atomic numbers
compresses atoms so elec are so close to nucleus that prot convert to neut
converts atomic nucleus to a small volume w/ high mass by expelling neut
forms ions that bond electrostatically into very small volumes
5
On a Hertzprung-Russell Diagram, our Sun is classified as ________.
an average star
a yellow giant
a mediocre star
a yellow dwarf
6
The first stars formed about 300 million years after Big Bang in the most massive nebulae because
only the massive nebulae had the material needed to make stars
it took that long for enough matter to form to make a star
the massive nebulae had enough gravity to collapse and condense
all nebulae then were massive. Wasn't until later that small nebulae formed
7
Which color stars have the highest surface temperature?
blue
red
yellow
orange
8
A red giant has ________.
high gas pressure
a hydrogen-rich core
a helium-rich core
an iron-rich core
9
Cepheid Variables = stars whose brightness varies in a predictable manner. Absolute magnitude of star can be determined
by direction of motion
by distance from Earth
by composition
by size
10
Spiral galaxies tend to resemble a pinwheel because ________
stars in center of galaxy are moving more slowly than ones on outer edges
stars in center of galaxy are moving faster than ones on the outer edges
stars are moving from the center to the edges of the galaxy
the barred structures form twisted pathways that distort the flow patterns
11
Interstellar matter is composed primarily of
oxygen
hydrogen
helium
ions
12
What is a "main sequence star"?
a star that is aligned with many other, similar colored stars
a star that is in a group of stars with similar ages and sizes
a star that is statistically indistinguishable from 90% of all stars
a star that falls in a band on the H-R Diagram with most other stars
13
The largest known galaxies are ________.
round
barred spiral
spiral
elliptical
14
A Hertzsprung-Russell diagram (H-R Diagram) is a plot of ________.
temperature versus color
size versus brightness
color versus brightness
brightness versus temperature
15
The final stage for a star which is as massive as the Sun is a ________.
main-sequence
white dwarf
red giant
black hole
16
Most stars are in this stage of evolution.
white dwarf
red giant
main-sequence star
black hole
17
What is the main factor that determines what will happen to a star after it consumes all of its nuclear fuel?
temperature
mass
composition
size
18
Based on the observed red shifts in the spectral lines of distant galaxies, astronomers conclude that
the universe is expanding
the universe is contracting
Earth is in the center of the universe
the universe is in a steady state
19
The main difference between Bright and Dark Nebulae is ________.
their proximity to a blue star
the composition of their dust
the composition of their gases
their proximity to a black hole
20
The densest stars known to exist are ________.
white dwarfs
neutron stars
red dwarfs
black holes
21
Which main-sequence stars are the most massive?
blue
yellow
orange
red
22
Evidence for the existence of dark matter includes the observation that ________
Mercury rotates about the Sun faster than Pluto
the universe is not expanding as fast as predicted by Big Bang Theory
the universe appears to be slowing down
stars near the center of galaxies do not rotate as fast as expected

JCHS Earth/Space Science Chapter 24 Test Review Flashcards | StudBud