How should we expect that the interstellar medium of the Milky Way will be different in 50 billion years?
A) The total amount of gas will be much less than it is today.
B) 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.
C) The total amount of gas will be much greater, since many stars will undergo supernovae between now and then.
D) The total amount of gas will be about the same, but it will contain a much higher percentage of elements heavier than hydrogen and helium.
A) The total amount of gas will be much less than it is today.
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Why do today's high tides arrive about an hour later than yesterday's tides?
A. The tidal bulges include dry land as well as water, and dry land responds to the tidal forces more slowly. B. The gravitational pull of the Sun on the tidal bulges slows their flow around Earth. C. Friction between the surface of Earth and the water slow the water's motion. D. The Moon rises and sets about an hour later every day, and the tides follow the Moon.
How do we learn the chemical composition of the interstellar medium?
A) We make an educated guess based on the Sun's composition. B) By studying spectra of interstellar gas clouds. C) We collect samples of gas and dust from interstellar space. D) We use computer simulations of the interstellar medium.
It is likely that both Pluto and Triton were originally ________
Fill in the blank(s) with correct word
In latitudes where the subsurface layer of soil always remains frozen, the frozen layer is called
a. an aquifer. b. the frost table. c. a glacier. d. permafrost.