The redshift due to the Doppler effect is caused by
A)
sources of light moving toward the Solar System.
B)
sources of light moving away from the Solar System.
C)
sources of light obscured by interstellar dust.
D)
sources of light moving at right angles to the Solar System.
E)
an effect not yet believed to be understood.
B
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Kuiper Belt is a collection of iron meteorites
Indicate whether the statement is true or false
It is possible to see the third-quarter Moon near the western horizon at sunrise
Indicate whether the statement is true or false
B-type stars have lifetimes
A) long enough for advanced life to evolve B) too short for planet formation C) long enough for planets to form but not for life to appear D) long enough for planets to form and for simple life to appear, but not long enough for advanced life to develop
Studies of multiplanet exoplanet systems have shown us that other planetary systems can sometimes differ from ours by
A) having their planets packed much closer to each other than our solar system's planets B) exist in binary star systems C) containing planets with much lower masses D) two of these