1972
The first satellite to watch over Earth
NASA launched Landsat 1, the first satellite built solely to study and monitor our own planet. Its images now track forests, farms, glaciers, and coastlines across decades of change.
Source: Wikipedia
The Almanac
July 23
2 things science and human progress accomplished on this date.
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1999
Chandra opens an X-ray window on the universe
Space Shuttle Columbia launched with Eileen Collins as the first female shuttle commander, carrying the Chandra X-ray Observatory to orbit. Chandra reveals black holes and exploding stars invisible to ordinary telescopes.
Source: Wikipedia
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