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