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ESS: Unit Review: Galaxies and The Universe Flashcards | StudBud
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ESS: Unit Review: Galaxies and The Universe
ESS: Unit Review: Galaxies and The Universe
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#Spacescience #middleschool #galaxies #theuniverse
Flashcards
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Questions
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Answers
1
If a Cepheid variable star has a short cycle,
it is actually a fairly bright star.
it must be close.
it must be far away.
it is actually a fairly dim star.
2
What theory would be supported by an increasing number of blueshifted galaxies?
Oscillating Universe
Big Bang
Modern Nebular
Doppler Effect
3
The farther away a star is
the smaller its luminosity.
the smaller its parallax shift.
the greater its luminosity.
the larger its parallax shift.
4
This tells us that a star or galaxy is moving toward us.
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1
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Two Cepheid variables appear to have the same brightness. Which one is further away?
The one with the shortest cycle.
Same distance away because they are standard candles.
The one with the longest cycle.
You can’t tell because you don’t know their true brightness.
6
The H-R diagram tells us that
if a main sequence star appears bright, it must be close.
if a blue main sequence star appears dim, it must be far.
if a main sequence star is hot and blue, it must be close.
if a red main sequence star is appears dim, it must be far.
7
A star with a large apparent magnitude number and a small absolute magnitude number
must be far away
would be similar to our sun
varies in brightness
has a low luminosity
8
How bright a star looks when viewed from Earth.
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The reason that a star’s apparent magnitude is usually different from its absolute magnitude is
distance.
the apparent magnitude is always higher.
the absolute magnitude is always higher.
the star varies in brightness
10
Parallax is limited mostly by
Cepheid variable changing their brightness in irregular way
the baseline distance between your eyes.
the shift of distant stars becoming too small to measure.
the distorting effect of Earth’s atmosphere.
11
90% of all stars would plot in this region of an H-R diagram.
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5
4
7
12
Where do the largest ordinary stars plot on the H-R diagram?
upper left
lower left
lower right
upper right
13
Quasars are
all very powerful objects.
all of the above
all very ancient
all very distant
14
The farthest objects in the universe are
black holes.
nebulas.
galaxies
quasars.
15
Shows the relationship of brightness to temperature.
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3
1
16
The oldest stars that could be plotted on an H-R diagram are
neutron stars.
red giants.
white dwarfs.
blue main sequence stars.
17
Who determined that galaxies are far away and the universe is expanding?
Albert Einstein
Edwin Hubble
Galileo
Johannes Kepler
18
An observation that tells us that a star or galaxy is moving away.
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1
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The Milky Way galaxy is most likely
elliptical.
a spiral.
irregular.
a barred spiral
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How bright a star really is, the brightest stars have low numbers.
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2
7
4
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Groups of millions or billions of stars are called
constellations.
conglomerates.
spectral binaries.
galaxies.
22
The brightest main sequence stars are
most like the sun
blue and hot
red and cool.
variables.
