What astronomical object is the most important source for determining the age of our Solar System?
A) lunar rocks
B) Earth core samples
C) meteorites
D) meteors
E) asteroids
Correct Answer:
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Q33: Once a protoplanet reached a large mass,
Q34: As a radioactive substance gradually decays, the
Q35: Comets are composed of _.
A) rock and
Q36: According to solar nebula theory, what is
Q37: The outer planets are composed of _.
A)
Q39: Who was the first to propose solar
Q40: The inner planets are composed of _.
A)
Q41: Match the planetary body with its definition.
Q42: Which best describes the transit method?
A) observing
Q43: Explain the Jovian problem and some possible
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