Which book was authored by Copernicus that explained the Sun as the center of a planetary system?
a. Alfonsine Tables
b. De Revolutionibus
c. Stderreus Nunctus
d. The Prutenie Tables
e. The Forerunner of the Universe, Containing the Mystery of the Universe
b
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The average distance from Earth to the Sun is _____
A) 1 AU B) 2 AU C) 3 AU D) 4 AU
A planetary nebula is
a. the expelled outer atmosphere of a medium-mass star. b. produced by a supernova explosion. c. produced by a nova explosion. d. a nebula within which planets are forming. e. a cloud of hot gas surrounding a planet.
Suppose the energy density from a charge has a value at a position 3 meters away from a point charge. If the charge is quadrupled, by what factor does the energy density change at the same position 3 meters away?
a. 8/3 c. 4 b. 4/9 d. 16
How fast does a pulsar initially spin?
a. 10 times per second b. 1 time per second c. 100 times per second d. 1000 times per second