Almost all properties of other stars are described relative to our Sun
Indicate whether the statement is true or false
TRUE
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Which of the following is not a piece of evidence supporting the conclusion that active galactic nuclei are powered by accretion disks around supermassive black holes?
A) Observed radiation from the galactic center varies significantly in brightness in times as short as a few days. B) Infrared observations show that many stars are forming near the centers of active galaxies. C) Radio observations sometimes show long jets of material extending millions of light-years out from the galactic center. D) The total amount of radiation coming from the galactic center is, in some cases, comparable to the amount of radiation put out by 10 billion or more ordinary stars. E) Spectral lines from the galactic center indicate that clouds of gas are orbiting a central object at very high speed.
The Doppler effect is sensitive only to motion along the line of sight
Indicate whether the statement is true or false
________ is the planet with the slowest rotation period
Fill in the blank(s) with correct word
Two clean, glass plates spaced 0.2 mm apart are placed in 20°C water. How far up the plates will the water climb if the contact angle is 0°?
(A) 75 mm (B) 70 mm (C) 65 mm (D) 60 mm