What is red and blue shift?

Redshift means : When you look at the object, they actually moving away from you, but the color you look at them is red.....
According to the Hubble flow.... galaxies moving 72km/s/Mpc from us

Blueshift means : ....the object come toward you, appear blue color.
This one not so sure, maybe -17km/s/Mpc

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We come without a thing and gone without a thing. We need simple life. A cup of teas and a couple of meals per day, that is good enough. And this is my standard of living.

How can you tell the difference between a red/blue shift object and an object that is just that color? What about objects that aren't in the visible light spectrum?

Let me to answer that :
The difference between a RS/BS, a RS has a longer wavelength and lower temperature, but a BS has a shorter wavelength and a hotter temperature.

That would be the dark object, which would be Black color... but sometime even when the gas or the dust absorb the light we still can detect it, by looking at the emission line spectrum. The time when we cant see the object its 100% dark. You know one more thing I forget... RS/BS can be used even when we are NOT deal with visible line.

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We come without a thing and gone without a thing. We need simple life. A cup of teas and a couple of meals per day, that is good enough. And this is my standard of living.

I believe you look at the pattern of emission / absorption lines in the spectrum and it is this pattern that actually shifts to a lower or higher wavelength.

Galaxygirl- my understanding is, and maybe this is too symplistic, that when the light from a star is passed through a prism the lines of the gases and minerals show a definite shift one way or the other. A RS, as stated, means the star is going away from the observer, and vice-versa. This way astronomers looking at a particular object, over time, can determine if the object is a planet, star or a pair of twin stars orbiting each other, and so on. Hope this helps. I can't give you any reference other than look in some astronomy book,
Tom

As the Sun rotates toward us there is a red shift on that side and when it rotates away, a blue shift, as it goes around.

Astronomers don't usually take into account the frequencies above the blue shift, into the ultra-violet, or below the red into the infra-red, and below, in measurments of this phenomena, in dertermining distance, or direction, going away from earth, or coming toward it.

You never here of a spectrum ultra-violet shift, or a infra-red-radio shift.

Prime

http://antwrp.gsfc.nasa.gov/apod/image/000...qso582_sdss.gif

distance record broken, a new far away galaxy found past the edge of our universe?

http://antwrp.gsfc.nasa.gov/apod/image/040...z10_vlt_big.jpg