We can measure fairly accurately the radial speed of a star or galaxy by measuring the Doppler shift of the emitted light from the star. Stars emit specific frequencies of light, and we can measure the frequencies to determine what elements are contained within the star. But since we know exactly what the frequencies are, we can measure the precise frequencies that we measure from the star. A star moving toward us will have its light "blue-shifted", or compressed a tiny bit in frequency. The amount of the compression tells us the radial velocity. A star whose light is red-shifted is moving away from us.
Radial velocity is the part of the velocity that is directly toward or away from us; Doppler shifts don't tell us anything about a star's side-to-side motion.
One of the astonishing discoveries of Edwin Hubble is that most galaxies are moving away from us, and the farther away they are, the faster they seem to be receding. Some nearby galaxies are moving closer, but the more distant the galaxy, the faster it is moving moving away. He determined this by the "red shift" of the light from distant galaxies.
Redshifted.
Red shifted
Red Shift
This is usually expressed, equivalently, as a reduction in frequency. It means that the galaxy moves away from us. For more information, you may want to read about redshift.
The nearest "big" galaxy after the Milky Way is called the Andromeda galaxy, because with our line of sight from earth, it appears to be in the the constellation Andromeda. It is 2.5 million light years away.
were part of a galaxy?!! _____________________________ Yes, we are. It's part of the Earthling's Handbook; didn't you get a copy? The majority of other galaxies are moving away from us. (One notable exception is the Andromeda Galaxy; our Milky Way will probably collide with Andromeda in about 4 billion years or so.) Curiously, the farther away from us a galaxy is, the faster it seems to be receding! The relationship is called "Hubble's Law" for the man who figured it out, Edwin Hubble. (The Hubble Space Telescope is named in his honor.)
-- Once you get past our "local group", every galaxy is moving away from us. -- The farther any galaxy is from us, the faster it's moving away from us.
Red. It's called Redshift When it moves quickly away it's called Blueshift
The farther a galaxy, the faster it moves away from us.
The farther away the galaxy is from ours the faster it moves from our galaxy.
Red Shift
One important clue is the Doppler effect - the redshift of distant galaxies. It turns out that the greater the distance to a galaxy, the faster it moves away from us.One important clue is the Doppler effect - the redshift of distant galaxies. It turns out that the greater the distance to a galaxy, the faster it moves away from us.One important clue is the Doppler effect - the redshift of distant galaxies. It turns out that the greater the distance to a galaxy, the faster it moves away from us.One important clue is the Doppler effect - the redshift of distant galaxies. It turns out that the greater the distance to a galaxy, the faster it moves away from us.
By the redshift of the galaxies. In general, the farther away a galaxy is from us, the faster it moves away from us.
By using some method other than the Doppler effect to calculate the distance of a distant galaxy, and using the Doppler effect to see how fast it moves away from us. A galaxy's distance and how fast it moves away from us are roughly proportional.
It means that, the farther away a galaxy is from us, the faster it moves away from us.
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This is usually expressed, equivalently, as a reduction in frequency. It means that the galaxy moves away from us. For more information, you may want to read about redshift.
You could use PET CORRECTER but be sure to praise him/her if she/he moves away when you have quickly sprayed this (away from its face ).
When industry moves away, a flourishing town may quickly become decadent.