Chemistry classes will appreciate this color-coded, single-page reference sheet for The Standard Model of particle physics. It is divided into two main sections: elementary particles and compound particles, both with their antiparticles....

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.

This site explores the smaller bodies in the solar system, namely the various asteroids and comets. Links are also provided for additional information on related subjects.

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.

This site from the encyclopedia Wikipedia is a good resource page on asteroids. Gives details on different groups of asteroids that have been identified; how they get their name and number after identification; the six types of...