"Download the text (20th edition, January 2007). This site provides a free physics textbook that tells the story of...2500 years of exploration."

Wow, there sure are a lot of wonderful astronomy blogs!

Wow, there sure are a lot of wonderful science blogs!

Renderings of landscapes on Mars using Terragen and Mars Orbiter Laser Altimeter (MOLA) data

"Hunter-gatherers practiced the most successful and logest-lasting life style in human history. In contrast, we’re still struggling with the mess into which agriculture has tumbled us, and it’s unclear whether we can solve it."

View the Earth as currently seen from a satellite in Earth orbit, choose the satellite from the list below and press the "View Earth from Satellite" button...satellite database is updated regularly.

Does anyone want to join The Planetary Society, the world's largest space-interest group?

This is a inspiring example of blending techno- and natural approaches to eco-friendliness. '...Our twelve hundred square foot roof captures on average 3600 cubic feet (27,000 gallons) of water per year...'

'The Daily Galaxy -News from Planet Earth & Beyond, is an eclectic text and video presentation of fascinating, often irreverent, news and insights on science, technology, and popular culture (music, film, events).'