The greenhouse effect always results in a(n) ________ surface temperature
Fill in the blank(s) with correct word
higher or hotter
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Discuss how astronomers know that our galaxy contains spiral arms in its disk
What will be an ideal response?
Under which circumstances can you be sure that the thermal pressure within a gas cloud is increasing?
A) The cloud's temperature and density are both increasing. B) The cloud's temperature is increasing and its density is decreasing. C) The cloud's temperature and density are both decreasing. D) The cloud's temperature is decreasing and its density is increasing. E) It is impossible to say.
A monochromatic light source emits a wavelength of 403 nm in air. When passing through a liquid, the wavelength reduces to 363 nm. What is the liquid's index of refraction?
a. 1.23 b. 1.05 c. 1.11 d. 1.90 e. 1.81
What is SgrA*?
A) a source of bright X-ray emission coming from the entire constellation of Sagittarius B) a source of bright radio emission in the center of our galaxy C) a source that is bright in the visible wavelengths in the center of our galaxy D) the brightest star in the constellation Sagittarius E) the bulge at the center of our galaxy