A(n) ________ represents a relatively peaceful mass loss as a red giant becomes a white dwarf
A) nova
B) planetary nebula
C) supernova
D) emission nebula
E) supernova remnant
B
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The Hubble law is one of the most important relations in modern astronomy because it ____
a. allows astronomers to measure the distance to very distant galaxies using only their spectrum b. explains the difference in the types of galaxies seen in different directions c. relates the rotation curve of a galaxy to the amount of dark matter it contains d. connects the mass of a spiral galaxy's bulge to the size of its central black hole e. determines the mass of a cluster using the rotation period of the galaxies it contains
In order to determine the mass of a planet by applying Newton's laws of motion and gravity, the planet must have:
A) rings. B) moons. C) a solid surface. D) a known size and distance from Earth. E) planets further from the Sun than itself.
The explanation of the behavior of light based on the ray model is called "geometric optics."
Indicate whether the statement is true or false
Based on current evidence and models, the total amount of matter (both luminous matter and dark matter) represents approximately what percentage of the total mass and energy of the universe?
A) about 1 percent B) about 10 percent C) about 30 percent D) about 50 percent E) 100 percent