What is a Red galaxy?
referring to astronomy and space exploration
The universe is expanding, so things are moving away from each other. The farther apart, the higher the relative speed, in general. The light from a galaxy that is moving away from you is shifted toward longer wavelengths, so visible light gets shifted toward the infrared. So galaxies far away appear more red than they would up close. Red galaxies.
It is known as Unltra-red galaxies. Unltra-red galaxies may be cosmic 'missing link' Space telescope sees them at the for reaches of the universe. The astronomers spotted four remarkably red galaxies near 13 billion light - years from Earth. Researchers says, the four galaxies are grouped together and appear to be physically associated, rather than constituting a chance alignment of like objects. Astronomers says, "In a sense, these galaxies might be a 'missing link' in galatic evolution".
There are three main reasons why a galaxy may appear red, researchers said, First it may be extremely dusty. Second, it could contain many old, red stars. Or third, the galaxy may be extremely distant, in which case the expantion of the universe has stretched its light to very long (and very red) wavelengths.
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