What is an atmospheric window?
A. a region in the atmosphere where light can get through
B. a part of the upper atmosphere with depleted ozone
C. a region in the atmosphere where infrared radiation can penetrate
D. a range of wavelengths of electromagnetic radiation which transmit through Earth's atmosphere
Answer: D
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Fine silica flour (fine powder) added to a polymer is a(n) _____________.
Fill in the blank(s) with the appropriate word(s).
It was the distribution of ________ that showed Harlow Shapley we were nowhere near the center of the Milky Way early in the 20th century
A) planetary nebulae B) emission nebulae C) open clusters D) globular clusters E) supernova remnants
One of the implications of quantum mechanics is that
A. extremely small particles can never be observed. B. Newtonian physics was a mistake. C. the act of observation may alter the entity being observed.
The most common form of gas in the disk of the Milky Way galaxy is ________
A) atomic hydrogen gas B) gas in hot bubbles C) molecular hydrogen D) gas in stellar winds