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.

The Swiss Propulsion Laboratory is a non-profit organization whose primary goal is the development of means of lifting civilian payloads into low-earth orbit at reasonable prices.

Why do some regions experience full-time heat while others are reckoning with frigid temperatures and snow? And why are the seasons reversed in the two hemispheres? Rebecca Kaplan explains how the shape of the Earth's orbit around the...

These hands-on activities are a great way for students to gain perspective on the relative sizes and distances of each planet, the relationship between the sun and Earth, and much 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.

This is an extensive online review of the 17 Apollo missions. Resources are organized by mission number and include descriptions, mission details, photographs, and scientific data sets.

This site provides a short description of the space shuttle and what it is used for, with diagrams and one quiz question.

Students use the process of journaling to make discoveries about the moon. This activity involves having students write observations about the moon in a journal. Using their observations they go to an online resource and choose...

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.

The Sun is the ultimate source of the energy that powers weather systems on Earth. Geomagnetic storms are sun-powered storms in the upper atmosphere, arising from energized particles that are periodically ejected by the Sun. Among other...

In this unit, students learn the very basics of navigation, including the different kinds of navigation and their purpose. The concepts of relative and absolute location, latitude, longitude and cardinal directions are discussed, as well...

The focus of this series of lessons is to engage students in an exploration of the world around them. The emphasis is on inquiry as students learn about the earth, sun, light, shapes and more.

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.

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

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...

"One Small Step, The Race To The Moon" is a clear presentation of the story of the Moon landing program that the United States conducted during the 1960's and early 1970's. After launching the presentation click on the phases of the Moon...

The homepage of the Center for Space Research at the University of Texas whose mission is "to conduct research in orbit determination, space geodesy, the Earth and its environment, exporation of the solar system, as well as expanding the...

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...

Named in honor of Danish physicist Hans Christian Oersted, Denmark's first satellite has been observing and mapping the magnetic field of the Earth.

Picture of the Earth with an astronaut flying around in orbit.

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.

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

Why does the Moon always shows the same face to the Earth? Why is the Moon's rotation period the same as the length of time it takes to orbit the Earth? Why are there two tides a day? These questions and more are answered here.

Describes the WISE Project, which has an infrared telescope orbiting the Earth taking photographs of never before seen areas of space.