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Ch 30 Holt Earth Science Flashcards | StudBud
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Ch 30 Holt Earth Science
Ch 30 Holt Earth Science
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Answers
1
How does a main-sequence star generate energy?
by nuclear fission; hydrogen becomes iron
by nuclear fusion; helium becomes hydrogen
by nuclear fission; hydrogen becomes helium
by nuclear fusion; hydrogen to helium
2
the brightness of a star as seen from Earth
absolute magnitude
light-year
apparent magnitude
3
A protostar becomes a star when _.
nuclear fusion starts
nuclear fission starts
nuclear fusion ends
nuclear fission ends
4
A large, bright star whose hot core has used most of its hydrogen is a _.
giant
pulsar
nova
5
a galaxy with a nucleus of bright stars with arms that circle around it
ellipse
irregular
spiral-barred
spiral
6
how is energy generated in a main-sequence star’s core?
hydrogen fuses into helium
hydrogen fuses into carbon
helium fuses into hydrogen
7
a large cloud of gas and dust in space where stars are born
nova
nebula
neutron
8
an object so dense that even light cannot escape its gravity
nova
protostar
black hole
9
By analyzing the light that a star emits, astronomers can determine ...
the motion of a star
the size and weight of astar
the composition of a star
the galaxy that the star belongs to
10
A star moving away from the Earth has a spectrum that is __
shifted toward blue
losing its color
shifted toward red
11
a galaxy that can be nearly round or very elongated like a football
irregular
spiral-barred
ellipse
spiral
12
A chart that shows the relationship between a star’s temperature and its absolute magnitude
Star Table
H-R Diagram
Spectroscope
13
How long would a star with the sun’s mass stay on the main sequence?
thousands of years
billions of years
millions of years
14
About how many stars are visible from Earth
without a telescope
?
thousands
billions
millions
15
the brightness of a star, if all the stars were at the same distance from Earth
apparent magnitude
light-year
absolute magnitude
16
What is a galaxy?
planets, moons, and stars held together by magnetism
stars, dust, and gas held together by gravity
debris, dirt, and trash held together by gravity
air, gas, and rock in the universe
17
Why do stars seem to move in the night sky?
because of parallax
stars revolve around theEarth
the Earth is standing still
because the Earth is in motion
18
an apparent shift in position of an object when viewed from different locations
red shift
orbit
parallax
19
What type of galaxy is the Milky Way?
irregular
elliptical
spiral
barred-spiral
20
the apparent shift in wavelength of light as the source moves away from or toward observer
red shift
Doppler effect
parallax
21
the distance light travels in a year
astronomical unit
light year
doppler effect
22
Many astronomers believe that black dwarfs _
are hotter than white dwarfs
may not exist
are more dense than whitedwarfs
23
a dense collapsed star, whose electrons and protons smashed together to form neutrons
neutron star
black hole
nebula
24
a group of stars organized in a pattern, and the region of space around them
constellation
galaxy
nebula
25
Why is Hubble’s discovery that there is a red shift in the spectra of galaxies important?
It gives evidence that theuniverse is contracting
It gives evidence of the big bang theory
It proves the big bang theory
It gives evidence of the existenceof black holes
26
How do scientists determine the composition of stars?
through magnetic testing
by analyzing the vibrations
by sampling matter on thesurface
by analyzing the spectra ofthe light
27
Why do the stars appear to move in the sky?
galaxies are moving
the univers is expanding
the sky is moving
Earth is moving
28
a shrinking, spinning disk in space with a central core of matter; formed from a nebula
protostar
white dwarf
neutron star
29
What is a white dwarf?
a cold, expanded core of matter
a hot, expanded core of matter
a cold, extremely densecore of matter
a hot, extremely dense core of matter
30
What can parallax be used to calculate?
the distance to stars thatare extremely far away
the distance to a star within 1,000 light-years of Earth
the composition of stars
the temperature of stars
31
What are binary stars?
stars like the sun andEarth
pairs of revolving starsheld together by gravity
stars with two poles
pairs of stars held motionless by gravity
32
a large explosion on a star that makes it brighter
black hole
nova
nebula
33
What color are the coolest stars?
yellow
blue
white
red
34
a galaxy that has no particular shape
spiral-barred
ellipse
spiral
irregular
35
A small, hot, extremely dense core left after a star collapses is a _.
white dwarf
red giant
black dwarf
36
Hubble’s discovery that there was red shift in the spectra of galaxies is evidence that _.
the universe is contracting
universe is extremely cold
universe is expanding
universe is extremely old
