Calculations show that gravity begins to overcome thermal pressure in clouds that are
A) less massive than the Sun.
B) more massive than the Sun.
C) more massive than ten times the Sun.
D) more massive than a hundred times the Sun.
E) more massive than a thousand times the Sun.
D
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What will be an ideal response?
During a very cold winter, water pipes sometimes burst due to
A) the ground contracting when colder. B) water expanding when freezing. C) water contracting when freezing. D) thawing producing pressure on the pipes. E) none of the above
A line drawn through locations of equal atmospheric pressure is a(n)
a. equipress. b. anemometer. c. wind vane. d. isobar.
How should we expect the Milky Way's interstellar medium to be different in 50 billion years than it is today?
A) The total amount of gas will be about the same, but the percentage of elements heavier than hydrogen and helium will have risen from the current 2% to more than 50%. B) The total amount of gas will be much greater, since many stars will undergo supernovae between now and then. C) The total amount of gas will be much less than it is today. D) Thanks to the recycling of the star-gas-star cycle, the interstellar medium should look about the same in 50 billion years as it does today.