That quasars were at cosmological distances yet appeared like ordinary faint stars meant
A) they were the brightest stars ever observed.
B) they must be very large.
C) they must contain many O and B type stars.
D) they must be producing such large quantities of energy than even fusion could not explain their output.
E) they must be very small, but bright due to gravitational lensing.
Question 2
Suppose you heat up an oven and boil a pot of water. Which of the following explains why you would be burned by sticking your hand briefly in the pot but not by sticking your hand briefly in the oven?
A) The oven has a higher temperature than the water.
B) The water has a higher temperature than the oven.
C) The oven has a higher heat content than the water.
D) The molecules in the water are moving faster than the molecules in the oven.
E) The water has a higher heat content than the oven because of density.
Wood first appeared in plants called progymnosperms.
Stars vary widely in size.
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