"Redshift", which means that the frequency of the light as seen by us is LESS than the frequency at which it was emitted, tells us that an object is moving away from us.
Doppler shift tells the distance form the earth station
A red shift indicates an object that is moving away from the observer, and a blue shift indicates an object that is moving toward the observer. Both of these are called Doppler shifts.
The amount of reddening is directly proportional to the speed of the object away from the observer (if the object is moving tangentially, even at a high speed, no red shift will be noticeable. Follow the link below for a bit more information on the mathematics and measurements of red shifts.
SSo the astronomers can tell us what is happening to the sun. that good enough? :)
Less than you'd think. At extreme distances, the red-shift is caused by metric expansion more than by motion. So to be able to gauge the speed of an object relative to you, you'd first have to determine the pseudo-speed caused by metric expansion.
By using the habo space telescle to detect the object's velocity
blah blah black sheep
Doppler shift tells the distance form the earth station
spectrocity...absorption of select frequency of light ie spectrocity
A red shift indicates an object that is moving away from the observer, and a blue shift indicates an object that is moving toward the observer. Both of these are called Doppler shifts.
The amount of reddening is directly proportional to the speed of the object away from the observer (if the object is moving tangentially, even at a high speed, no red shift will be noticeable. Follow the link below for a bit more information on the mathematics and measurements of red shifts.
Yes, or at least it is used in determining that. However, it is only part of a much larger calculation in determining if it has a red or blue shift
Assuming the object's moving rapidly enough to affect the light from it observedly: If approaching the light will be biased to blue (higher-f, lower wavelength); If receding, the light will be redder (red-shift), or lower-f, longer wavelength) by Doppler effect. If the true spectrum can be determined then the shift either way can be used to calculate the object's speed relative to the observer (not necessarily its true speed!).
SSo the astronomers can tell us what is happening to the sun. that good enough? :)
This is the same thing as temperature. Remember, heat is just the movement of particles.
A dolphin uses echolocation to find what it needs to. It bounces off an object to tell what it is.
Astronomers are able to identify chemicals in distant space with the use of spectral analysis. This breaks the light apart into a spectrum and find either emission lines or absorption lines and identifies which elements are present.