"This site is a tool for amateur astronomers who love to pursue deep sky objects. It employs a web-based version of the Saguaro Astronomy Club's database (ver 7.2), consisting of over 10,000 records. This online version of the SAC database allows amateur astronomers to compile detailed and customized observing lists."
"This map of Mars, published by Percival Lowell in 1895, was the result of many years spent carefully studying the Red Planet through his telescope. Now you can do the same through your web browser. In collaboration with NASA researchers at Arizona State University, we've created some of the most detailed scientific maps of Mars ever made. If you have half as much fun exploring them as we did making them, you're in for a great time."
"After over three decades, we're finally getting ready to go back to the Moon. To help you prepare, and to whet your appetite for exploration, we teamed up with scientists at the NASA Ames Research Center to bring you this collection of lunar maps and charts. This tool is an exciting new way to explore the story of the Apollo missions, still the only time mankind has set foot on another world."
"Traveling to the stars has never been easier! To help you explore the far reaches of our universe, we have teamed up with astronomers at some of the largest observatories in the world to bring you a new view of the sky. Using Google Maps this tool provides an exciting way to browse and explore the universe. You can find the positions of the planets and constellations on the sky and even watching the birth of distant galaxies as seen by the Hubble Space Telescope."
Skyview is a virtual observatory which allows users to view images of any part of the sky in all regimes from Radio to Gamma-Ray. Users can employ a variety of interfaces to enter a desired position, scale, and orientation. By calculating the coordinates it receives, Skyview returns a made-to-order image of a specific portion of the night sky.
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 stars above the horizon as seen from a specified observing site at a given date and time.