The discoveries they are making are letting us study how galaxies formed in the earliest days of the universe and may ultimately allow us to predict our universe's fate. Site describes history as well as applications of gravitational lensing. Billions and billions of stars and galaxies gleam mysteriouslyin the night sky, inspiring philosophical thoughts. Because of their pull on our imagination, stars and their evolution have been the focus of much of astronomy. Yet almost equally compelling is the blackness between them.
Site lays out the evidence, structure and current theories about dark matter in a readable way.
According to a report published in January 1999, small ghost galaxies, dense clumps of dark matter whose stars have burned out, may lurk unseen throughout the universe. Astronomers John Kormendy and Kenneth Freeman analyzed studies from the past 20 years that have traced the motion of stars and gas in a wide range of galaxies. The emergence of flowering plants, or angiosperms, was one of the most significant events in evolutionary history. They include most major crops, and are the basis for medicines, dyes, clothing and spices. Site provides a lavishly illustrated look into the sexual habits of flowering plants.