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Chapter 12, 8th Grade
Test Description: Galaxies and stuff
Instructions: Answer all questions to get your test result.
1) Patterns and pictures made from stars in the night sky are called
A
imaginations
B
galaxies
C
constellations
D
consternations
2) How many constellations are there?
A
18
B
22
C
45
D
88
3) Higher light wavelengths have ___ energy
A
the same amount of
B
fluctuating
C
higher
D
lower
4) What does the spectrum of a star tell us?
A
the star's temperature
B
a star's age
C
all of the above
D
what a star is made of
5) If a star has a negative apparent magnitude, what does this mean?
A
it appears very bright
B
it didn't do well at the reality fair.
C
it appears very dim
D
it is a medium-bright star
6) Luminosity depends on
A
a star's temperature and size
B
a star's age and size
C
a star's distance and temperature
D
a star's temperature and age
7) What powers stars?
A
iron
B
fire
C
nuclear fusion
D
nuclear fission
8) Which is NOT an inner layer of a star?
A
the convection zone
B
the radiative zone
C
the corona
D
the core
9) Which is NOT part of the atmosphere of a star?
A
the photosphere
B
the corona
C
the radiative zone
D
the chromosphere
10) How do most stars exist?
A
near black holes
B
by themselves
C
in multiple star systems
D
all of the above
11) Tight, spherical clusters of stars that are the same age and the same distance from Earth are called
A
globular clusters
B
spherical clusters
C
open clusters
D
elliptical clusters
12) Stars are classified by their
A
distance
B
spectra
C
size
D
temperature
13) A star's ___ determines its temperature and color
A
mass
B
distance
C
magnitude
D
luminosity
14) Which has the shortest life span?
A
higher-mass stars
B
they have equal life spans
C
mass has nothing to do with it
D
lower-mass stars
15) Why do higher-mass stars have short life spans?
A
the more gravity that pulls inward, the hotter the core gets and the faster fuel is burned
B
the color of the star determines its life span.
C
the fuel is spread out over time
D
the less fuel it has, the quicker it runs out
16) When do stars leave the main sequence?
A
when they no longer fuse helium into carbon
B
when they lose gravity
C
when they run out of dust
D
when they no longer fuse hydrogen into helium
17) Which star leaves the main sequence and turns into a red giant and later a white dwarf?
A
higher-mass star
B
lower-mass star
18) What holds galaxies together?
A
gravity
B
strong force
C
nuclear force
D
superglue
19) It is thought that more than 90% of the universe is made of
A
ALIENS
B
matter
C
dark matter
D
empty space
20) How are galaxies distributed throughout the universe?
A
none of the above
B
they are clumped together in clusters
C
they are mostly even, with a few groups here and there
D
they are spread out evenly
*select an answer for all questions
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