In a neutral atom, the number of protons is equal to the number of ______________
Fill in the blank(s) with correct word
electrons
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Based solely on its distance from the Sun, we would expect the surface of Venus to be
A) colder than the Earth such that water would freeze B) warmer than the Earth, but not so warm that liquid water could not exist C) roughly the same temperature as the Earth so that water would mostly be in liquid form D) very much warmer than the Earth such that liquid water could not exist on the surface
Ptolemy's model of the universe
a. was heliocentric. b. included elliptical orbits. c. contained epicycles. d. was heliocentric, included elliptical orbits, and contained epicycles. e. None of the other choices are correct.
Weather occurs in which layer of the atmosphere? Why?
What will be an ideal response?
Suppose a scientist holds a press conference at which he claims that 10% of the matter in the Milky Way is in the form of dust grains. Does his claim seem reasonable? Why or why not?
A) It is reasonable because we already know that interstellar dust obscures our view through the disk of the galaxy. B) The 10% figure is too high because there are not enough heavy elements to make that much dust. C) It seems reasonable as long as we assume that red giant stars—which produce dust grains in their stellar winds—are more common than we thought. D) The 10% figure is too low because most of the mass of the galaxy is in the form of interstellar dust.