The seriousness of an asteroid collision is gauged by the ______________ scale
a. Torino
b. Richter
c. Decibel
d. Sunami
e. Star
a
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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
The diagram illustrates a light source, a gas cloud, and three different lines of sight. Along which line of sight would an observer see a continuous spectrum?
a. 1
b. 2
c. 3
d. 2 and 3
e. none of them
The ____________ of a black hole is the radius from a black hole at which the escape velocity is approximately equal to the speed of light
a. Roche limit b. Lagrangian point c. Chandraskhar limit d. Hubble radius e. event horizon
Which of the following describes tectonics?
A) the excavation of bowl-shaped depressions by asteroids or comets striking a planet's surface B) the eruption of molten rock from a planet's interior to its surface C) the disruption of a planet's surface by internal stresses D) the wearing down or building up of geological features by wind, water, ice, and other phenomena of planetary weather