About how old is the universe?
A) 6.0 billion years
B) 10.5 billion years
C) 13.7 billion years
D) 20 billion years
Correct Answer:
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Q8: Which type of star has the shortest
Q9: Nearby stars appear to move _ relative
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
Q14: Where a main sequence star is located
Q15: Red giants are enormously bright because they
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
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