2006-07-02 20:42:28 · 6 answers · asked by mohamed.kapci 3 in Science & Mathematics ➔ Physics
Pascal is correct: it is because the universe is expanding, But I will elaborate a bit: because of Doppler effect, a receding radiation source will have a lower apparent frequency than one which is not, and the shift in frequency is proportional to the speed of recession. Distant galaxies are receding faster than ones nearby, so will have larger redshifts than ones nearby.
-- Robert A. Saunders, Lake Stevens, WA.
2006-07-02 20:53:14 · answer #1 · answered by Anonymous · 0⤊ 0⤋
Because the universe seems to be expanding UNIFORMLY. All objects are moving away from all other objects in proportion to their distance. A common example to explain this is blowing up a balloon. So, the galaxies farthest from you are moving away from you the fastest, thus the greater red-shift. This appears to be true no matter where in the universe you look. This was a significant discovery, and was important to figuring out the history of the universe.
2006-07-03 03:55:32 · answer #2 · answered by Frank N 7 · 0⤊ 0⤋
The far galaxies are travelling away from us at a faster speed than closer galaxies are and that is why the farther galaxies have a greater red shift.
2006-07-03 07:07:42 · answer #3 · answered by Anonymous · 0⤊ 0⤋
Red light travels farther than other light, hence the telescope has to be adjusted to a red shift in order to find the 'Far Out' galaxies! Closer galaxies aren't as hard to find so, the red shift isn't needed. -use the force.
2006-07-03 03:50:17 · answer #4 · answered by Anonymous · 0⤊ 0⤋
Because they move away from us. If they move away from the observer we will see long wavelength light, which is red. Thus the further away the moving object is from us, we will see it having larger redshifts because the wavelengths get strached by the expanding space.
2006-07-03 03:53:21 · answer #5 · answered by Adriana S 1 · 0⤊ 0⤋
Because the universe is expanding.
2006-07-03 03:46:56 · answer #6 · answered by Pascal 7 · 0⤊ 0⤋