Exploring Meteorite Mysteries: Teacherπs Guide

Public Domain from NASA

Includes complete lessons plans for everything about meteorites.

http://www-curator.jsc.nasa.gov/outreach1/expmetmys/ExpmetMys.htm

The Universe at Your Fingertips

A HUGE binder full of activities for astronomy. Something for every grade level. Cost $39.95 and is available online at the Astronomical Society of the Pacific's AstroShop. I particularly recommend the comet activities.

http://www.astrosociety.org/education/astro/astropubs/universe.html

Project AstroBio website

Get partnered with a professional interested in astronomy and astrobiology who will visit your classroom at least 3 times during the year. This is a fantastic and free resource. Applications are online and due in April for the following school year.

http://www.astro.washington.edu/projastrobio/

Solar System Collisions

Send an asteroid hurtling towards your favorite planet! Change the asteroidπs composition, diameter and velocity.

http://janus.astro.umd.edu/astro/impact/