Dark matter was initially proposed to explain
A) the velocities of stars and gases in spiral galaxy arms.
B) stellar nebulae.
C) black holes.
D) the expansion of the universe.
A
Physics & Space Science
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What is the gravitational force between two 20-kg iron balls separated by a distance of 0.5 m? The gravitational constant is G = 6.67 ´ 10-11 N-m2/kg2.
A. 2.67 ´ 10-9 N B. 5.34 ´ 10-9 N C. 5.34 ´ 10-8 N D. 1.07 ´ 10-7 N
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To what three types of modern survivors can the masses of the protogalactic blobs be compared?
What will be an ideal response?
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What maximum velocity does the star attain?
What will be an ideal response?
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In contrast to the photosphere's continuum, the spectrum of the chromosphere is dominated by ________ lines
Fill in the blank(s) with correct word
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