It was 20 years ago today…

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On this date in July 1997, NASA placed the first rover on Mars. Sojourner was followed by Spirit and Opportunity, then Curiosity. It was preceded by Vikings I and II. All lasted far longer than expected.
Today 55 years ago, Telstar, the first TV communications satellite, launched.
And 48 years ago Sunday, Apollo 11 left for the moon. It landed 4 days later.

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