The vast majority of galaxies in the universe are ________ and ________
Fill in the blank(s) with correct word
dwarf irregulars; dwarf ellipticals
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Ultraviolet radiation from a star
a. will not penetrate Earth's atmosphere and reach the ground. b. has a wavelength that is longer than the visible light emitted by the star. c. has a wavelength that is shorter than the x-rays emitted by the star. d. a and b e. b and c
The most distant stars we can currently measure stellar parallax for are approximately
A) in the Andromeda Galaxy. B) 1,000 parsecs away. C) 5 parsecs away. D) 10,000 parsecs away. E) halfway across the Milky Way Galaxy.
During each cycle of its operation, a certain heat engine does 40 joules of work while exhausting 160 joules of thermal energy to the environment. The energy efficiency of this heat engine is
A) 75%. B) 80%. C) 25%. D) 20%. E) None of the above.
The circles in the picture below are Gaussian surfaces. All other lines are electric field lines. For which cases is the flux non-zero?