Created by astrophysicist Richard Powell, An Atlas of the Universe is a Web site that allows visitors to see nine main maps of the universe, ranging from 12.5 light years to 15 billion light years from the sun. Each map then contains several other corresponding maps as well as descriptions of what is being shown. The maps give perspective to the vastness that lies beyond earth and explains,...

The Sloan Digital Sky Survey "will map in detail one-quarter of the entire sky, determining the positions and absolute brightnesses of more than 100 million celestial objects" as well as "measure the distances to more than a million galaxies and quasars." The website details the Astrophysical Research Consortium (ARC) mapmaking strategies, timelines, survey progress, and project goals. Visitors...

One of many educational pages devised by entrepreneur and programmer John Walker, YourSky is a virtual planetarium. Visitors to the site can use the Sky Map to produce astronomical maps by entering time and date, viewpoint, and observing location (latitude/longitude and ascension/declination). The Virtual Telescope helps you to track comets and asteroids, and Horizon Views returns views of the...