Neptune and Uranus have a bluish tint because
A) at their distances, the Sun appears blue, the red absorbed by dust in the ecliptic.
B) they are far away and distance makes objects appear bluish.
C) their atmospheres contain methane, which absorbs red light.
D) their atmospheres contain hydrogen and helium.
E) ammonia ice reflects blue light better than any other color.
C
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Which of these would typically be among the brightest stars in an ancient globular cluster?
A) A4 B) K3 C) O3 D) B3 E) M5
Coulomb's Law: Two small identically charged balls are a certain distance apart. The vectors in the figure show the magnitude and direction of the electrostatic force on each ball due to the other one. Suppose that the charge on the left ball is now doubled (represented by two plus signs). Which vector diagram below best represents the forces that now act on each of the two balls?
A. 
B. 
C. 
D. 
When the Universe was young, it was
A. smaller and less dense. B. bigger and colder. C. bigger and hotter. D. bigger and more dense. E. smaller and hotter.
Suppose one twin takes a ride in a spaceship traveling at a very high speed to a distant star and then back again, while the other twin remains on Earth
Compared to the twin who remained on Earth, the astronaut twin is A) the same age as the Earth-twin. B) younger than the Earth-twin. C) older than the Earth-twin. D) The ages cannot be determined from the information provided.