Galaxies have stars of varying ages, but the stars of elliptical galaxies are typically....
A. Population I.
B. Population II.
C. blue-white.
D. contained in the spiral disk.
Ans: B. Population II.
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The greatest inaccuracy in Copernicus's model of the solar system was that the planets
a. traveled in circular orbits with uniform motion. b. traveled on epicycles whose centers followed orbits around the Sun. c. traveled in elliptical orbits. d. were allowed to travel backwards in their orbits. e. orbited the Sun.
The slope of a velocity vs. time graph is the __________
Fill in the blank(s) with correct word
Supernovae are triggered because iron releases the most fusion energy of any element
a. True b. False Indicate whether the statement is true or false
A beta particle is another name for a(n) __________
Fill in the blank(s) with correct word