What is a planetesimal?
A) A rotating cloud of interstellar gases
B) A celestial body that orbits the sun but cannot clear its own neighborhood
C) Rocky material accreted through repeated collisions
D) The core of a star that has gone through a nova
Correct Answer:
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Q12: Which of the following processes created the
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Q14: The _ explains the formation of the
Q15: _ is the speed required for an
Q17: The major bombardment period that shaped much
Q18: Today, erosion on the moon is dominated
Q19: How many planets are in our solar
Q20: What substance makes up the core of
Q21: _ is the largest known asteroid.
A)Pluto
B)Eris
C)Ceres
D)Andromeda
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