Dark Matter :: physics science space

Missing Diagrams You, the data processor youre sitting at, the air you breathe, even the distant stars are all(a) made up of protons electrons and neutrons. For a long m this ordinary matter, or what physicists like to call baryonic matter, was thought to be the main constitute of the humans. However, in the past twenty years evidence has been accumulating to the contrary, that in fact the universe is much stranger than ever thought of before and is almost only made up of manything that we arseholet see.For a long time astronomers werent concerned about the book of objects that they couldnt see. For example the body politic is too small and dim to see from any great hold and all the planets in out solar system make up less than one percent of the total mass of the sun. However it in short became a concern when astronomers began to measure the mass of galactic bunchs and it became apparent that in that respect was a significant amount of matter unaccounted for.In the thirti es, astronomers named Zwicky and Smith both(prenominal) examined closely two relatively nearby chunks, the Coma cluster and the Virgo cluster. They looked at the individual galaxies making up the clusters individually, and the velocities of the clusters. What they found was that the velocities of the galaxies were about a part of ten to one hundred larger than they expected. In a cluster the main force is the gravitational pull of the galaxies on one some other which gives rise to their velocities. By knowing the velocities of the galaxies the total mass of the cluster can be determined. If your web browser is Java-aware -- e.g., Netscape 2.0b or higher, try this experiment. It allows you to vary the mass inside a galaxy cluster, and watch the individual galaxies. Experiment I ( Courtesy of Johns Homepage http//www.astro.queensu.ca/dursi/dm-tutorial/dm1.html) Now like all observations there is a certain(a) amount of error involved. In this cas e, watching the galaxies in a cluster takes years of observation and the velocities are hard to determine due to the slam of the cluster. Its not like the experiment were the dots are whizzing around. Also some of the galaxies measured may not be in the cluster entirely are just in the line of site of the telescope.