NASA
Nasa: Asteroid 2012 Da14: Earth Flyby Reality Check
Get a reality check about a recent asteroid fly-by. Study videos, diagrams, and explanations of these near-misses.
Florida State University
Florida State University: Photomicrographs: The Moon Rock Collection
A small sample of some of the 3000 photomicrographs of rocks returned to Earth by the Apollo astronauts. Click on the "Primer" page to see how the photos are made and what the different colors mean.
American Museum of Natural History
American Museum of Natural History: Ology: Astronomy: In Pictures: Beyond Planet Earth
What would it be like to travel across the solar system and explore space? Take a look at some of the places that humans might go to someday, and the questions that scientists are asking.
NASA
Nasa Science: For Kids: Solar System Fun
Test your knowledge about the solar system with games and activities designed to help explore what you know about the sun, the planets and their moons, space rocks, the Milky Way, and related topics.
Other
Skyserver: Asteroids
This site from the SkyServer allows you to learn all about moving objects as well as how to find asteroids. Users that feel adventurous may even decide to take the "Asteroid Hunt."