Since when we see Saturn's rings edge-on, they seem to disappear; they must be ________
Fill in the blank(s) with correct word
very thin
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You can see your image in a mirror because of
a. interference. b. diffraction. c. specular reflection. d. diffuse reflection. e. polarization.
Which of the following was the most perfect region according to Aristotle's philosophy?
A) The center of the Sun B) The heavens C) Earth's surface D) Earth's center
As a rock sinks deeper and deeper into water of constant density, what happens to the buoyant force exerted on it by water on it if it started above the surface of the water?
A) The buoyant force keeps increasing steadily. B) The buoyant force remains constant. C) The buoyant force first increases and then remains constant. D) The buoyant force steadily decreases.
The Local Group is slightly more than _____ in diameter
A) 1 Mpc B) 2 Mpc C) 3 Mpc D) 4 Mpc