What is a "main sequence star"?

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

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

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

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

Spiral galaxies tend to resemble a pinwheel because ________

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

How do astronomers believe an irregular galaxy forms?

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

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

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JCHS Earth/Space Science Chapter 24 Test Review

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Beyon Our Solar System

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

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