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May 1, 2025
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First US Satellite (jan 31, 1958 – feb 18, 1958)

Description:

Detection of van Allen belts and first US Satellite in space
https://solarsystem.nasa.gov/system/news_items/main_images/285_explorer_1_image_2.jpg

Added to timeline:

19 Nov 2019
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Date:

jan 31, 1958
feb 18, 1958
~ 18 days