Astronomy Encyclopedia: Britannica Singapore offers a range of astronomy information free, and it can be cited in school projects.

Astronomy for Kids: Facts about the Solar System, Sun, Meteorites, Stars, Galaxies, Planets, Moon, Comets, Asteroids, and a Dictionary; written for kids

Astronomy.com: For Kids: Facts and information about planets, constellations, and MORE

Cosmos4Kids.com: Facts and Information about the universe, galaxies, stars, solar system, and space exploration

Enchanted Learning: All About Space: Links to information about astronomy, the planets, and MORE!

Kids' Astronomy.com: This site takes you to the moons of Jupiter; explore the possibility of life on these distant worlds. Travel through the expanse of the universe and discover just how much SPACE there is in Space, and learn how modern day scientists are pushing the limits of space exploration every day; packed with games, activities, fun facts, and resources

American Museum of Natural History: Astronomy for Kids: Information, resources, and interactive activities for teaching and learning about Astronomy

NASA Science for Students: Grades K-12: Student areas divided by grades: K-4, 5-8, 9-12; an EXCELLENT resource covering all aspects of astronomy; includes videos and MORE

Space Kids: Explore the world around you. NASA brings an exciting way to look at our Sun and Earth, our solar system and the universe beyond.

Space Place: Elementary-level site with lots of neat projects, facts and opportunities to share ideas

StarChild: A Learning Center for Young Astronomers: An excellent resource written for students. Covers all astronomy topics in detail.

ThinkQuest: Astronomy for Kids: Site about outer space. Learn about black holes, comets, constellations, eclipses, observation equipment, phases of the Moon, the planets, the stars and the Sun, and last but not least the Universe. You will find neat pictures, and be able to use a virtual telescope.

Alien Earth: An interactive site which provides information about the formation of planets and stars and the search for life. Each of the sections has slide shows and interactives that help with understanding the concepts. Build a "perfect" solar system, learn about the life cycles of stars and how astronomers use the light of stars to search for Earth size planets, create a community of microorganisms, or use the Drake Equation interactive to an estimate of how many planets out there support life.
Ask a NASA Scientist: If You Have a Question about Space, ask to receive an answer; a collection of past questions and answers

Ask the Astronomers: Ask to receive an answer; a collection of past questions and answers

Astro Planet: Designed by NASA, AstroVenture challenges students to search for and design a habitable planet.

Astrobiology at NASA: A wealth of information on astrobiology (the study of life in space) and related activities at NASA. Among the site's offerings are the latest astrobiology news, an introduction to and overview of the study of astrobiology, discussions on the technologies used and future missions, workshop links, educational resources, an "Ask an Astrobiologist" feature, and related links, among others.

Astronomy.com: Explore the universe: An excellent hobby site for not only astronomy buffs, but newcomers as well; explains the basics of the hobby; advises best telescopes to purchase; helps with observing the skies; and much MORE

Astronomy Picture of the Day: A different image of the universe posted daily

NASA Image Gallery: Photographs from NASA which include space mission, earth, planet, and weather photographs

NASA Space Science Homepage: Search for Origins; Structure and Evolution of the Universe; Exploration of the Solar System; the Sun-Earth Connection

PBS: Exploring Space: The Quest for Life: Examines the mysteries about the origin of life that may exist in space; meteorites and life, the search for aliens, the mars project; facts and information about space

People Important to the History of Astronomy: Listed in alphabetical order

The Science of Telling Time: A history

Space.com: Features daily updates on the latest innovations, the coolest discoveries, and hottest events in the world of Earth, space, and weather science

Space Science Institute: Educational site with interactive activities including a Mars Land Rover simulation, and space science games

Space Scientists Online: New and archived data from space projects, as well as chat and LTC events; specific areas covered include The Search for Origins, The Sun-Earth Connection, The Structure and Exploration of the Universe and Exploration of the Solar System

Space Place: Elementary-level site with lots of neat projects, facts and opportunities to share ideas

Starry Skies: An extensive collection of facts and information about the stars, planets, and MORE; image gallery

Skyview Virtual Observatory: A virtual observatory on the net generating images of any part of the sky at wavelengths in all regimes from Radio to Gamma-Ray

Views of the Solar System: A multimedia adventure unfolding the splendor of the sun, planets, moons, comets, asteroids, and more. Discover the latest scientific information, or study the history of space exploration, rocketry, early astronauts, space missions, spacecraft through a vast archive of photographs, scientific facts, text, graphics and videos.

Your Weight on Other Worlds: Ever wonder what you might weigh on Mars or The Moon? This website will give you the chance to find out!

Web Nebulae: Photos of web nebulae only accessible through a telescope, facts and information

Zoom Astronomy by Enchanted Learning Software: A comprehensive on-line site about space and astronomy. It is designed for people of all ages and levels of comprehension. It has an easy-to-use structure that allows readers to start at a basic level on each topic and then to progress to much more advanced information as desired