Word: dopplered
(lookup in dictionary)
(lookup stats)
Dates: all
Sort By: most recent first
(reverse)
...Signal Corps repeated the experiment many times, and disinterested scientists checked the results. Sample check: the echo wave at moonrise-when the first contact was made-was slightly higher in frequency than the outgoing pulse. In accordance with the Doppler Effect, a wave reflected from an approaching body must increase its frequency. Chiefly because of the earth's revolution, the moon at that hour was moving toward the sending station at about 750 miles an hour...
...various elements and compounds can be identified. Light from Mars comes through the earth's air blanket, which contains water vapor, so Dr. Adams had to separate the terrestrial vapor pattern from the Martian (if any). This he did with the help of a phenomenon called the Doppler effect: when a source of light approaches earth, its spectrum lines are shifted to the right, and when it is receding they are shifted to the left. At times when Mars is fast approaching or retreating, the Doppler effect should pull the Martian vapor lines away from the earth lines enough...
...should be "stretched" by the strain-i. e. suffer an increase of wavelength, which should displace spectrum lines toward the red (long wavelength) end. Thus, light winging away from a heavy star should show a definite redshift. Obstacle to confirmation was that another and unrelated spectrum shift existed (the Doppler effect), due to the motion of the star away from or toward the observer. Last week the same Dr. Trumpler announced that he had solved the difficulty by measuring the redshift of nine "O" stars (hottest, brightest, heaviest in the sky) moving along in clusters with other stars. The redshift...
Stars look redder than most astrophysical criteria indicate that they actually are. This apparent astral rubrication might be due to 1) the speeding of stars away from Earth (the Doppler effect of lengthening waves) or 2) the scattering of starlight by star dust and star gases which permeate space...
...universe is dependent upon matter. Abbé Lemaître, Belgian mathematician, investigated Einstein's universe, found that it would be unstable, would necessarily either expand to infinity or contract to a point. Immediately astronomers looked at the stars, measured the amount of spectral shift in starlight (the Doppler effect). They found most starlight shifted towards the red end of the spectrum, interpreted it to mean movement away from the earth (TIME, Oct. 6), concluded that material bodies were spreading, expanding universal boundaries. Dr. Fritz Zwicky of California Institute of Technology and Dr. P. ten Brieggencate, Dutch astronomer, however...