Mercury's surface most resembles which of these?
A) the Earth's deserts
B) the lunar far side
C) the lunar mare
D) Venus' polar regions
E) Mars' deserts
B
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Between 0° and 4°C, the volume coefficient of expansion for water
a. is positive. b. is zero. c. is becoming less dense. d. is negative.
Nuclear Reactions: Determine the missing product X in the following nuclear reaction: 
O + neutron ? X + alpha particle
Fill in the blank(s) with the appropriate word(s).
Which of the following statements comparing halo stars to our Sun is not true?
A) Most stars in the halo have either died or are in their final stages of life, while the Sun is only in about the middle of its lifetime. B) Most stars in the halo have cooler surface temperatures than the Sun. C) Most stars in the halo are less luminous than the Sun. D) Most stars in the halo contain a much lower percentage of heavy elements than the Sun.
Captain Jirk reports to headquarters that he left the planet Senesca 1.88 × 10^4 seconds earlier. Headquarters sends back the message: "Was that spaceship proper time?" It will be spaceship proper time if it was
a. measured by one clock fixed at one spot on Senesca. b. measured by one clock fixed at one spot on the spaceship. c. measured by a clock on Senesca at departure and by a clock on the spaceship when reporting. d. measured by a clock on the spaceship when departing and by a clock on Senesca when reporting. e. calculated by dividing the distance from Senesca according to Senesca by the speed of the spaceship.