NASA
Nasa: Space Place: Messenger: Planet Mass Comparison
Compare the masses of planets in this interactive animation. Simply pile a number of Earths on one side of the scale, to balance with the mass of one Jupiter. Then try this with all the planets.
Library of Congress
Loc: Poetry 180: Forgotten Planet
This poet reminisces about childhood as he listens to his daughter's lack of undertanding about the names of the all of the planets.
NASA
Nasa: Mission Science: What Is a Planet?
Find out about how planets have been classified historically, and what scientists use to study them.
NASA
Nasa: Planets in a Bottle
In this simple lesson, students grow yeast to learn how the climates on each of the nine planets would affect life.
Nine Planets
The Nine Planets: An Overview of the Solar System
A detailed overview of the history, mythology, and current scientific knowledge of each of the planets and moons in the solar system.
Wikimedia
Wikipedia: Pluto
Wikipedia, a publicly-maintained encyclopedia, provides an article on the dwarf planet, Pluto, including images, physical characteristics, history of its naming, the planet/dwarf planet debate, and more.
Ducksters
Ducksters: Kids Science: Learn About the Dwarf Planet Pluto
Kids astronomy. What is Pluto like? How do we know about this dwarf planet?
Science4Fun
Science4 Fun: Pluto
Learn fun facts and details about the atmosphere, geography, composition, and discovery of Pluto, a dwarf planet.
Washington State University
Washington State University: Ask Dr. Universe: Is Pluto a Planet Again or Not?
Dr. Universe answers this question after talking with WSU's Katie Cooper. Katie is an expert in the geology of Earth and objects in outer space.
California Institute of Technology
The Discovery of Eris, the Largest Known Dwarf Planet
Until the discovery of Eris, Pluto was known as the largest Keiper belt object. This dwarf planet has replaced Pluto in size and is accompanied by a satellite that has been given the name Dysnomia. Learn about this distant world here...
Enchanted Learning
Enchanted Learning: Zoom Astronomy: All About Space
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...
Australian Broadcasting Corporation
Australian Broadcasting Corporation: News in Science: The Planet Formerly Known as Pluto
From ABC News in Science, this article discusses issues related to Pluto its removal from planetary status. The brief article also touches on the renaming and re-listing process of Pluto.
ClassFlow
Class Flow: What Happened to Pluto?
[Free Registration/Login Required] This flipchart was created to teach students about Pluto and the recent news of it NOT being a planet (officially). Lots of ways for students to vote on why as well as discussions about what other facts...
ClassFlow
Class Flow: Pluto Redefined
[Free Registration/Login Required] This flipchart briefly describes the new definition of planet as determined by the International Astronomical Union.
TeachEngineering
Teach Engineering: The Outer Planets
Young scholars explore the outermost planets of our solar system: Saturn, Uranus and Neptune. They also learn about characteristics of Pluto and its interactions with Neptune. Students learn a little about the history of space travel as...
Nine Planets
The Eight Planets: Just for Kids
Here is a clear, simple picture of the solar system. Click on the names of the planets to learn more about each. Clicking on underlined terms takes you to more and more detailed scientific information.
Other
University of Leicester: The Solar System
Resource explores the solar system, with an in depth discussion of each of the planets and their properties.
NASA
Nasa: Solar System Exploration
This stunning site on the solar system gives a great overview of the planets and our sun. Learn about each object's size, vital statistics, and moons. Then go on for a more in depth look at these objects in the column on the left.
Harvard University
Harvard University: The Solar System
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.
Space Telescope Science Institute
Hubble Site: Solar System Images
A listing of clickable images of objects in the Solar System from the Hubble telescope that includes the following: Venus, Mars, Jupiter, Jupiter's satellites, Saturn, Saturn's rings and satellites, Uranus, Uranus' rings and satellites,...
Famous Scientists
Famous Scientists: Michael E. Brown
This article discusses the life and scientific discoveries of Michael E. Brown. Learn how he is credited with downgrading Pluto from a planet to dwarf planet.
Famous Scientists
Famous Scientists: Clyde Tombaugh
Find out about Clyde Tombaugh, the scientist who discovered the dwarf planet Pluto in 1930, and also discovered a number of asteroids.
NASA
Nasa: The Space Place: Hail King of the Ice Dwarfs
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.
Kidport
Kidport: Space Science
This complete resource will help students to improve their understand of space exploration. Includes images of the universe, galaxies, stars and planets.