Comets, meteors, and asteroids . G. P. Putnam's Sons. Stony asteroid devastated Siberia. New Scientist , p. 16. Popular Science , pp.
Community resources Local astronomical societies or astronomy clubs.
Main Activity Make craters like David did in the Newton's Apple segment. Measure what factors make a difference in how big a crater is. Be sure the sand is loose and dry beneath it. Pick an object to act as your meteorite. Measure and record its length and, if you have a scale, weigh your meteorite and record that figure, too.