This resource is a place for learning all about astronomy--stargazing, planets, space science, and interesting astronomical phenomena and discoveries. Explore, ask questions, find information, and meet American Museum of Natural History...

A fantastic collection of information about the solar system. Includes information on all of the planets, the moon, the sun, asteroids, comets, meteoroids, and stars. Also find puzzles, a dictionary, quizzes, classroom activities, and...

This survey of the planets includes all the basics, size, mass, atmosphere, length of day, and the like. It features interactive activities and learning exercises and compares all of the planets in colorful tables.

This illustration from the Lunar and Planetary Laboratory shows the approximate sizes of the planets relative to each other. Note that the planets are not shown at appropriate distances from the Sun.

This section of the exhibition gives the history of the discovery and study of space starting with the Greeks and Romans through to the early 1900's.

In this interactive tutorial students will learn what causes the seasons, diurnal cycles and how the constellations move through the sky. Learn we are able to see other planets and how astronomical events affected life on the Earth.

Eight hands-on lessons module in which students explore the characteristics of planet Earth, its moons, the sun, the solar system, planets, and the difference between science fact and science fiction.

A portal to resources on the sun, the Earth's neighboring planets, and the weather in space. Find out why Saturn is the "jewel of the Solar System" and explore what happens when Venus and Mercury make their rare transits across the sun.

In this interactive module students will explore what different ancient cultures believe was an explanation of the stars and planets. They will look at how the work of Nicolas Copernicus revolutionize the world of astronomy and learn how...

Explore the mythology, structure, observational history, gravitational force, and orbit of Earth's Moon.

Learn some of the characteristics of Mars. These characteristics lead some people to believe that life forms may be found on the fourth planet from the Sun.

This set of activities teaches students about the big picture of science using Mars as an example: how to collect data, use evidence, and look at models.

Resource explores the solar system, with an in depth discussion of each of the planets and their properties.

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.

A university-level course in basic observational procedures in astronomy. Covers how to use a telescope, and includes lecture notes.

Take this ten-question self-scoring quiz to test your knowledge of astronomy facts: age of the universe, why stars and planets are spheres, where other life might exist in the outer space, the Milky Way, and more.

In ancient times only five planets were known: Mercury, Venus, Mars, Jupiter, and Saturn. Learn about Greek astronomer Ptolemy's theory for the solar system that was to survive for fourteen centuries.

[Free Registration/Login Required] This nonfiction piece discusses the discovery of previously unknown planets in the solar system. This passage is a stand-alone curricular piece that reinforces essential reading skills and strategies...

Where is our Solar System? How far away is the sun? What makes up the sun? Find out all you want to know about our solar system. This is a comprehensive on-line site about space and astronomy. Check out all of the excitement!

NASA scientist Sten Odenwald calls this his "web site for the astronomically disadvantaged." Do you have lots of questions about space that you can't seem to get answers to? Would you like to learn about a career in astronomy, Big Bang...

A collection of ten hands-on science experiments for the entire family that will help you understand concepts in astronomy. Make an astrolabe, find the size of the sun and moon, build a lunar settlement, find out about meteoroids, shadow...

Classroom lesson for teaching astronomy uses PowerPoint presentations and illustrations of Kepler's light curves used to discover planets.

A different image is featured each day along with descriptive narrative. NASA offers different and sometimes unexpected views of our Earth and the universe.

A detailed explanation of retrograde motion with three different explanations and movies to accompany them. Additional links are available for more research.