This site from Paper Plate Education provides an activity using only a globe and plastic cup to determine the position on the earth where the sun appears directly overhead. Plotting this point on several days throughout...

This is a set of six web pages, authored and curated by David P. Stern, describing four unconventional methods of accelerating spacecraft. These are using cannons, nuclear power, solar sails and ion rockets....

This site, hosted by the University of Washington's Earth and Space Sciences Program, discusses an advanced plasma propulsion system that will enable spacecraft to attain unprecedented speeds, with minimal energy and...

Ever wonder what it would look like to travel to a black hole? A neutron star? If so, you might find this page interesting. Here you will find descriptions and MPEG movies that take you on such exciting trips. These...