The stars stay in "fixed" positions on the celestial sphere because they
A) are all located at precisely the same distance from Earth.
B) are so far away that our eyes don't notice their motions through space.
C) remain stationary relative to our solar system in space.
D) were given their names by ancient civilizations.
B) are so far away that our eyes don't notice their motions through space.
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The galactic halo or corona is believed to contain mostly
a. O and B stars. b. G, K, and M stars. c. open clusters d. globular clusters e. dark matter.
Based on current understanding, what exactly is causing the expansion of the universe to accelerate?
A) WIMPs B) neutrinos C) white dwarf supernovae D) Gravity E) We don't know, but we call it "dark energy."
A thermometer indicates 98.6? C. It may be:
A. outdoors on a cold day B. in a comfortable room C. in a cup of hot tea D. in a normal person's mouth E. in liquid air
A basketball player jumps to make a basket, and remains in the air for a moment. A sportscaster, talking about the game, then remarks that she has "defied gravity." Which of the following accurately describes the situation?
A) The player did stay in the air in spite of the Law of Gravitation, but a single counter-observation is not enough to warrant revisiting a theory that usually works. B) The player produced enough force with her legs to accelerate up into the air, and gravity brought her back down with an acceleration of 9.8 m/s2. C) The player only seemed to defy gravity, but part of the Universal Law of Gravitation makes an exception for basketball players. D) The player has defied gravity, so scientists must go back into the lab to refine their theory.