How Old Is the Universe? An article describing how scientists have determined the age of the universe.		New Planetary System Learn about the planets in other solar systems than ours.
History of the Calendar Learn about the history and purpose of calendars.		Sedna Debuts, Rattling Poor Pluto Learn about the discovery of Sedna – the most distant object ever identified in our solar...
The Vernal Equinox Distribute an article that explains why the first day of spring in the Northern hemisphere...		Soviet Staffed Space Flight Programs Use this reference and related activities to learn about the Soviet space program, space...
History of the Leonid Meteor Showers The recurring Leonid Meteor showers have been fascinating humans for many years. Read about the...		Cosmic Counsel Can the stars be your counsel? Read this article to learn more about astrology.
Global Warming: What It Is . . . Provides a definition of global warming.