Move the sun, earth, moon, and space station to see how it affects their gravitational forces and orbital paths. Visualize the sizes and distances between different heavenly bodies, and turn off gravity to see what would happen without it.

The learning module helps students gain a deeper understanding of gravity. Some topics explored are orbits, the mission to the Moon, and the first space walk. Activities and videos are included.

An excellent and thorough answer to the often asked question about high tide "bulges" on the side of Earth facing away from the Moon or Sun.

Travel back in history and see the first men on the moon. See photos of the crew, the launch, the landing and more.

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.

Describes the logic behind the development of Newton's law of universal gravitation. Beginning with Johannes Kepler and his three laws of planetary motion, content walks the reader through Newton's thought process and development of this...

This site provides a very interesting overview of our home planet, Earth. Content includes a focus on the atmosphere, the pull of gravity, and the active surface.

Students discover the Law of Universal Gravitation by changing the masses of planets and moons and the distance that separates them.

Students enter their weight here on Earth, and find out how much they would weigh on the moon and other planets.

This is the homepage of all of the archived information about and from the Galileo Mission. Included is data from the flybys of Venus, Earth, Moon, and Asteroids Gaspra and Ida, as well as the current data from Jupiter and its moons. See...

Animated sing-along storybook "Zoom Zoom" takes readers on a ride to the moon.

Through illustrated examples and interactive practice, students explore Newton's ability to relate the cause for heavenly motion (the orbit of the moon about the earth) to the cause for Earthly motion (the falling of an apple to the...

A science simulation launches a projectile from the top of a mountain testing Newton's theory introduced in Principia.

A demonstration/lab idea for determining the numerical value of the universal gravitation constant using a torsion balance.

States the equation of Newton's law of universal gravitation. States the value of G and uses the equation to solve problems.

This resource provides information about Earth and space. In addition, there is a quiz provided.

This site provides a very interesting overview of our home planet, Earth. Content includes a focus on the atmosphere, the pull of gravity, and the active surface.

A short description of how Cavendish measured the value of G - the universal gravitation constant and supported Newton's theory. Illustrated.

Students can see actual photos of a space shuttle launching from earth as well as the people who now could go because of technology. Learn about some of the equipment and vehicles used to make it happen.

An introduction to our solar system: the planets, our Sun and our Moon. Students begin by learning the history and engineering of space travel. They make simple rockets to acquire a basic understanding Newton's third law of motion. They...

Come along with the Agronauts and discover space in order to report back to Commander Spud Goodroot. Fun site provides all types of information about space science! Various missions include: 'What's In Our Sky?', 'The Root of the...

Even great scientists make mistakes! This illustrated essay from the NOVA Web site looks at Galileo's theory of the tides, which, while well thought out, was wrong.

Want to lose weight in a hurry? Just step on a scale on almost any other planet! This page allows you to enter your weight on Earth and it will calculate your weight on all of the other planets, some moons and even some stars. Requires a...

Want to lose weight in a hurry? Just step on a scale on almost any other planet! This page allows you to enter your weight on Earth and it will calculate your weight on all of the other planets, some moons and even some stars. Requires a...