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 much less than it is today.
B) 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%.
C) The total amount of gas will be much greater because many stars will undergo supernovae between now and then.
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.
A) The total amount of gas will be much less than it is today.
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Granulation is caused by
a. sunspots. b. rising and sink gases below the photosphere. c. shock waves in the corona. d. the solar wind flowing away from the corona. e. the heating in the chromosphere.
You are traveling in a space ship at half the speed of light (0.5c) directly toward an oncoming photon traveling at the speed of light (c). At what speed would you see the photon coming toward you?
A) c B) 0.25c C) 1.5c D) 0.5c
A protogalactic cloud with very little angular momentum is more likely to form an elliptical galaxy than a spiral galaxy
Indicate whether the statement is true or false
The quantum mechanical model of the hydrogen atom requires that if the principal quantum number is 6, there will be how many different permitted orbital quantum number(s)?
a. 5 b. 12 c. 6 d. 36 e. 13