Which planet, other than Earth, has visible water ice on it?
A) the Moon B) Venus C) Mercury D) Mars E) Jupiter
D
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During summer in the Southern hemisphere of Mars, winds travel
A) from the South Pole to the North Pole B) around the South Pole C) from the North Pole to the South Pole D) around the equator
Assuming the conditions ripe for life and intelligence abound in the Galaxy, what factor limits the number of galactic civilizations currently in existence?
A) the average survival time of the civilizations B) the lack of metals for technology C) the speed of technological development D) the expansion of the universe E) the number of supernova explosions
Most stars on the H-R diagram are on the ____________________
Fill in the blank(s) with correct word
If an object is moving, it has energy. we call energy of motion as ___________.
Fill in the blank(s) with the appropriate word(s).