For most of history, the lack of observable stellar parallax was interpreted to mean that
A) stars must all lie at the same distance from Earth, on the celestial sphere.
B) stars were too far away for parallax to be measured with available technology.
C) Earth is stationary at the center of the universe.
D) Galileo's theories of the universe were essentially correct.
C
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A student noticed a yellow, solid substance was formed when mixing two clear liquids during a lab. What term describes this yellow, solid substance
A. physical change B. exothermic reaction C. endothermic reaction D. precipitate
The excited state of a certain atom is 3.2 eV ± 0.21 eV
(a) What is the average lifetime of this state? (b) If the excited energy doubled (6.4 eV ± 0.21 eV) how would the lifetime be affected?
Globular clusters are primarily found in the ____________________ component of the galaxy
Fill in the blank(s) with correct word
An explorer walks into a lab in a science building. She has a compass in her hand and finds that the south pole of her compass points toward the room's East wall when she is nearer that wall and toward the west wall when she is nearer that wall. You could explain this if magnetized metal had been installed in the East and West walls with North poles pointing into the room. If no magnetic material
was installed in the North or South walls of the room, she would expect that a. the south pole of the compass would tend to point toward those walls. b. the north pole of the compass would tend to point toward those walls. c. the compass needle would not point in any particular direction. d. the north pole of the compass needle would tend to point toward the centers of those walls, but the south pole would tend to point toward the sides of those walls. e. the south pole of the compass needle would tend to point toward the centers of those walls, but the north pole would tend to point toward the sides of those walls.