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The Universe
Test Description: Components of the universe and corresponding sizing, and evidence of expanding universe using (Doppler Effect) red shift and Hubble's law.
Instructions: Answer all questions to get your test result.
1) Which statement best describes galaxies?
A
They are similar in size to the solar system.
B
They may contain billions of stars in a space much larger than our solar system.
C
They may contain a few hundred stars in a space slightly larger than the solar system.
D
They contain only one star but hundreds of planets.
2) Billions of stars in the same region of the universe are called
A
galaxies
B
constellations
C
asteroid belts
D
solar systems
3) According to the big bang theory, the universe began as an explosion and is still expanding. This theory is supported by observations that the stellar spectra of distant galaxies show a
A
shift toward the blue end of the spectrum
B
concentration in the green portion of the spectrum
C
concentration in the yellow portion of the spectrum
D
shift toward the red end of the spectrum
4) In which list are celestial features correctly shown in order of increasing size?
A
solar system -- galaxy -- planet -- universe
B
galaxy -- solar system -- universe -- planet
C
universe -- galaxy -- solar system -- planet
D
planet -- solar system -- galaxy -- universe
5) Based on the red-shift data on galaxies, most astronomers infer that the universe is currently
A
fixed and stationary
B
moving randomly
C
expanding
D
contracting
6) The unit most used by astronomers to express the distances to other galaxies is
A
astronomical unit (AU)
B
kilometers
C
Lightyears (LY)
D
miles
7) A light year is
A
the time it takes light to go once around the Earth's orbit
B
the time it takes light to travel one year
C
the distance traveled by light in one year
D
the distance the Earth moves in one year
8) The Milky Way galaxy is best described as
A
a constellation visible to everyone on Earth
B
a spiral-shaped formation composed of billions of stars
C
a type of solar system
D
a region in space between the orbits of Mars and Jupiter
9) A star moving toward the Earth will have a spectrum containing
A
dim lines.
B
blue shifted lines.
C
red shifted lines.
D
unshifted lines.
10) According to Hubbell's law more rapidly moving galaxies are now
A
already contracting toward another big bang
B
accelerating rapidly
C
closer to us
D
further away from us
*select an answer for all questions
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