At NOVA's Origins website, users can "journey back to the beginning of everything: the universe, Earth, and life itself." The web site offers a series of interactive modules where visitors can decide if life exists on...

The Online Journey Through Astronomy offers educational materials about studies leading to the discoveries of distant galaxies and the expansion of the universe. Topics covered here include: Olber's Paradox, comoving...

This web page, authored and curated by David P. Stern, outlines the math and applications of parallax. Parallax is the shift in the apparent direction to an object when it is viewed from two separated locations. It...

This lab activity provided by the University of Washington's Astronomy Department, gives an introduction to Big Bang Nucleosynthesis. This lab helps students understand why helium abundance in our universe provides...

The Annenberg Media organization has created this wonderful new resource for physics teachers, students, and anyone else who would care to learn more about dark matter, string theory, and other "big topics in modern...