The temperature of a protostar can reach 1,500 K but they are very hard to detect in visible wavelengths because of their low luminosity and because they are surrounded by dust.
Answer the following statement true (T) or false (F)
True
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When water freezes, the entropy of the water
A. increases. B. decreases. C. does not change. D. depending on other factors could increase or decrease
The cosmic microwave background radiation was emitted during a time when ____ was the important process in the Universe
a. recombination b. ionization c. fusion d. antiproton production e. positron production
Segmented mirrors sag under their own weight. Their optical shape must be controlled by computer-driven thrusters under the mirrors in what is called
a. an achromatic lens. b. active optics. c. a Schmidt-Cassegrain design. d. a Newtonian design. e. interferometry.
Metric System: The quantity 0.00325 × 10-8 cm is equivalent to
A. 3.25 × 10-12 mm. B. 3.25 × 10-11 mm. C. 3.25 × 10-10 mm. D. 3.25 × 10-9 mm. E. 3.25 × 10-8 mm.