Red giants are enormously bright because they are extremely hot.
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Q10: Stonehenge is an ancient observatory built in
A)ancient
Q11: It is known that if there is
Q12: A protostar is an accumulation of gases
Q13: About how old is the universe?
A)6.0 billion
Q14: Where a main sequence star is located
Q16: Earth rotates
A)from west to east.
B)from east to
Q17: Which of the following depends on your
Q18: The difference in brightness between two stars
Q19: The absolute magnitude considers the brightness of
Q20: Nuclear fusion reactions occur in what part
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