Observations and stellar evolution models indicate that the central star of a planetary nebula finally must contract and become a _____
A) yellow giant
B) white dwarf
C) red giant
D) black dwarf
B
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Which of the following most likely explains why Jupiter's interior releases so much heat?
A) Jupiter is gradually contracting in size. B) heat from radioactive decay C) a slow rate of nuclear fusion in Jupiter's core D) tidal heating
What is the frequency of yellow-green light that has a wavelength of 550 nm?
The force of gravity from one object extends to infinity never going to zero. When we say that gravitation is universal we mean that
a. the Earth exerts gravitational force on objects on its surface. b. the Earth exerts a gravitational force on its Moon and vice versa. c. the Earth, Moon, and Sun exert gravitational forces on each other. d. all material objects in the universe exert gravitational forces on one another.
The fresh, newly created surfaces of icy satellites of Jovian planets
a. appear dark in color with few impact craters. b. appear dark in color with many impact craters. c. appear very bright because fresh ice is very reflective. d. generally show long bright grooves and a modest number of impact craters. e. generally have small volcanoes that are active.