It is believed that ring galaxies form
a. when two galaxies collide at high speeds.
b. when two spiral galaxies collide, but not directly head on.
c. from a large cloud of gas and dust with very little angular momentum.
d. from a large cloud of gas and dust with a very high angular momentum.
e. when more than two galaxies collide at the same time.
a
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A(n) ____________________ is the largest known structure in the universe
Fill in the blank(s) with correct word
What might explain how the core formed?
A. the magnetic field pulling it inward B. asteroids hitting and penetrating C. iron sinking to the core as the bulk of Earth melted D. Earthquakes shake the planet and the iron gradually "sifts" downward. E. The silicon of the crust decays into iron at high temperatures.
Discoveries force theory revisions: The discovery of "hot Jupiters" forced scientists to revise the nebular theory of solar system formation
Think of a hypothetical discovery that would force further revisions of the theory of planet formation, and explain why this observation would contradict the theory.
P seismic waves can travel through ______________
a. solid material b. liquid c. gas d. plasma e. solid and liquid material