What features of the telescopic view of the Andromeda Galaxy, M-31, are also visible to the naked eye for our similar Galaxy?
What will be an ideal response?
In Andromeda, we see a tilted disk of stars, which in our home Galaxy is seen as the band of light stretching across the sky as the Milky Way. We lie inside this disk, so the band appears fairly narrow. Dust clouds and spiral arms are visible in the disk of M-31, and we also can make out portions of three arms with the naked eye, and nearby dust clouds visually create gaps in the band of distant star light.
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The electrons in a cloud of hydrogen gas are making the transitionfrom excited states tothe ground state. What does the spectrum of this cloud of gas lookalike?
a) It will be completely black at all wavelengths. b) It will be bright at every wavelength, giving off some radio waves, some visible light,and X-rays. c) It will consist of a few bright emission lines at very specific wavelengths. d) It will be bright at most colors, but with some dark absorption linesat very specific wavelengths. e) It will be identical to the spectrum of the Sun.
Novae are more closely related to type II than to type I supernovae
Indicate whether the statement is true or false
What is the frequency, in hertz, of a sound wave (v = 340 m/s) with a wavelength of 68 m?
a. 5 Hz b. 23120 Hz c. 340 Hz d. 0.2 Hz
In a folded sequence of rocks we find younger rocks at the axis of the fold and older rocks away from the fold axis. The fold is
A) called a syncline. B) called an anticline. C) plunging. D) tilted.