Letters From Our Readers, March 8, 2021

Perserverance rover
Credit: NASA/JPL-Caltech
SALTY OCEANS, NOT DEAD PLANETS NASA’s landing of Perseverance on Mars, as reported in “NASA Rover Picks Up Search for Life on Mars” (Feb. 22-March 7, p. 21) , is a great technical achievement. However, I understand that for years, eight or more rovers have landed on the planet looking for any sign...

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