Star Formation
Messier 100 is considered an starburst galaxy, with it concentrated within a ring -actually two tightly wound spiral arms attached to a small nuclear bar with a radius of 1 kilo-parsec-, where star formation has been taking place since at least 500 million years ago in separate bursts.
As usual on spiral galaxies of the Virgo Cluster, in the rest of the disk both star formation and neutral hydrogen, of which M100 is deficient compared to isolated spirals of similar Hubble type, are truncated within the galaxy's disk, something caused by interactions with the intracluster medium of Virgo.
Read more about this topic: Messier 100
Famous quotes containing the words star and/or formation:
“The star is the ultimate American verification of Jean Jacques Rousseau’s Emile. His mere existence proves the perfectability of any man or woman. Oh wonderful pliability of human nature, in a society where anyone can become a celebrity! And where any celebrity ... may become a star!”
—Daniel J. Boorstin (b. 1914)
“It is because the body is a machine that education is possible. Education is the formation of habits, a superinducing of an artificial organisation upon the natural organisation of the body.”
—Thomas Henry Huxley (1825–1895)