Satellite images of Earth at night have been a curiosity for the public and a tool of fundamental research for at least 25 years. They have provided a broad, beautiful picture, showing how humans have ...

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The U.S. National Park Service celebrated its centennial in 2016, commemorating 100 years of stewardship of America’s natural and historic treasures. Many of those monuments, scenic rivers, parks, and ...

NASA satellites and sensors constantly take the pulse of our planet, measuring how Earth changes by the day, season, year, and decade. Researchers and resource managers analyze those measurements and ...