Jupiter's extensive magnetosphere is responsible for _____ around the magnetic poles
A) aurorae
B) nebulas
C) meteors
D) penumbrae
A
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Suppose we imagine the Sun to be about the size of a grapefruit (about 10 cm across). How far away are the nearest stars (the three stars of Alpha Centauri)?
A) 2.5 miles B) 2,500 miles C) 250 miles D) the length of a football field E) 25,000 miles
A compact fluorescent lamp gives more light output for
A) less power. B) the same power. C) greater resistance.
Find the average density of a red giant star with a mass of 20 × 10^30 kg (approximately 10 solar masses) and a radius of 150 × 10^9 m (equal to the Earth's distance from the sun)
a. 1.41 × 10^-4 kg/m3 b. 0.007 kg/m3 c. 1.41 kg/m3 d. 710 kg/m3 e. 1.41 × 10^-3 kg/m3
What is main-sequence fitting?
A) a way of forcing stars to fit into a standard main sequence, even when they have some unusual characteristics B) a method for determining the age of a star cluster C) a method for determining the distance to a star cluster by assuming that its main sequence should line up with the main sequence on a standard H-R diagram D) the way we construct an H-R diagram by plotting the surface temperatures and luminosities of stars