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NASA
Nasa: This New Ocean
This site from NASA contains the text of the book "This New Ocean: A History of Project Mercury" by Loyd S. Swenson Jr., James M. Grimwood, and Charles C. Alexander.
NASA
Nasa: Image Science Center: Ask the Space Scientist Earth
Site from NASA contains a collection of 91 questions pertaining to the Earth's atmosphere, magnetic field, ionosphere, rotation and origin of life.
NASA
Nasa: Hubble Observations Shed Light on Jupiter Impact
Scientists continue to learn from their observations long after the largest collision in history was recorded. Was Comet SL-9 actually an asteroid? What were the dark impact clouds made of? What were the effects on Jupiter's magnetic field?