A Mystery of Space: S T A R S- [Redshift & Dark Matter]

     Redshift was an important factor for providing another piece of evidence that the universe is ever-expanding. What happens, is that when an object moves away from us, the lines separating the different colors in the spectrum of light get shifted, causing there to be more of one color, in this case, red. The amount of "redshift" is directly proportional to the object's velocity (how fast it is moving away from us). From observations of redshift, it can be deduced that the universe is expanding.
     Dark matter occurs everywhere in the universe. It is everything that makes up the space between all visible objects, gas, dust, etc., and cannot be seen except in special circumstances. When observing the night sky, scientists have shown that large halos of dark matter galaxies and galaxy clusters.
     Dark matter could make up between 90 to 99 percent of the universe! Scientists do not know everything that makes up dark matter, but think that neutrinos, which are almost sure to occur, MACHOs (MAssive Compact Halo Objects, which are non-nuclear objects that normally surround galaxies), and WIMPs (Weakly Interacting Massive Particles, which are theorized particles 10 to 100 times the size of protons, could account for lots of the dark matter) could be some the of the things that make up dark matter.