The heavy elements that make up most of Earth were formed via nuclear fusion in the center of the Sun.
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Q4: The number of classical planets in our
Q5: According to the figure below, if you
Q6: Our Sun is one of the most
Q7: The Copernican principle states that there is
Q8: Pluto is the only dwarf planet in
Q10: One consequence of the principle of universality
Q11: A light-year is a unit commonly used
Q12: A crucial component of a scientific theory
Q13: There are nearly 1,000 times more galaxies
Q14: The word astronomy means:
A) "patterns among the
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