Scholars gain an insight into the relative size of planets and distance between inner and outer planets with the help of informational text, a data table, and a series of four questions.  

New Horizons set forth on a mission to Pluto in 2006. Ten years later, the spacecraft is still on its way. Here, enthusiastic scholars predict what they will be like—likes, dislikes, hobbies, etc.—when New Horizons arrives at its...

Did the image I drew match the image you saw? By simulating a satellite and a ground station, teams of two transmit data in the form of pixels in order to recreate an image. They use four different levels of brightness, creating slightly...

In this space science activity, students read facts about the solar system. Students look at the diagram showing the position of the planets. Pluto is included as a planet here.

In this worksheet on asteroids, students look at a picture asteroids and read accompanying facts, along with a brief paragraph.

Part of the National Air and Space Museum's online exhibition about Exploring Planets, this describes and gives visuals of telescopes, probes and fly-by aircrafts, orbiters, and landers as current methods for earth and airborne...

Use this handy chart to help acquaint yourself with major facts about the solar system. This chart is broken down by planet and displays data such as the size of the planet, distance from the sun, rotation period, orbital period,...

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

This resource provides a nice overview of Pluto. Get information on Pluto's size, tilt, orbit and surface features. There is also a brief explanation of the "New Horizons" space probe.

An information page all about Pluto! Learn about Pluto's size, path around the sun, temperature, location, and traveling partner Charon.

Excellent Eight Planets site that provides a vast amount of information about planet Earth. Very comprehensive and complete site.

An equation for the law of universal gravitation is stated. The weight equation (W=m*g) is related to the law. An interactive JavaScript form allows the user to practice determining the force of gravity and the acceleration of gravity...

A basic overview of the planet Mars. Links to information about the other planets and objects in our solar system are included.

The BBC provides a general overview of the planet Earth. Content includes statistical information, a focus on the four seasons, moon information, and more.

This detailed essay defines planets and compares the characteristics to those of Pluto. Orbital graphs and background information clarify the change in Pluto's categorization. A copy of IAU's Resolution 5 is also contained in this essay.

A table listing the average radius of orbit for the nine planets about the sun; expressed in astronomical units. Data can be used to calculate the orbital speed or the orbital period.

The planet Mercury is profiled with information about its size, mass, atmosphere, length of day, and the like. Features include interactive activities and learning exercises.

A basic overview of the dwarf planet Pluto. Links to information about the other planets and objects in our solar system are included.

This site describes the extended belt of small bodies residing just outside the orbit of Pluto, the Kuiper Belt.

A detailed description of comets, their distinct parts, and the known comets in our solar system. Links are also provided for additional information on related subjects.

Explore the dozens of Saturn's moons orbiting the second largest planet of our solar system. Find out about the Cassini space mission which explored Saturn's largest moon, Titan.

Many facts about Mars are presented on this comprehensive site. Planet size, surface, length of day, orbit, atmosphere, moons, are a sampling of the many topics discussed on this site. You will also find an activity book, a quiz, a...

A basic introduction to artificial, or man-made, satellites. Links to information about the planets and other objects in our solar system are included.

Part of a larger site on the Solar System, this page offers an image of Uranus and information about its discovery, size, orbit, and atmosphere. Follow links in the left margin to read more about the planet's composition, rotation, and...