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What's cheaper than a new line of fighter jets?


In his wonderful 
When the Earth Had Two Moons, planetary geologist Erik Asphaug points out after bearing “the brunt of earth’s gravity for another three years in storage,” when the Galileo mission was finally launched, 2 ribs of the umbrella-like antennae that was to beam data back down failed to open. That forced the back-up antennae, capable of transmitting less than 0.1% of the high-gain antenna’s capacity, to takeover. Enter image compression, now known as the JPEG, and 70% of the data mission was accomplished. Whew.
But sharing his many stories that Columbus knew the size of the earth, it had been established for centuries, but intentionally underbid the cost & complexity to make it happen; how, in the 3 ....

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Mars February 18, 2021--"May Change the Way We Think About Our Origins and Extraterrestrial Life" (Weekend Feature)


 
Seven minutes of harrowing descent to the Red Planet occured on February 18th when NASA’s Perseverance rover a robotic “scientist” weighing 2,260 pounds–parachuted through the tenuous Martian air, marking a new era in red planet exploration. Once at the top of the Red Planet’s atmosphere, a science-fiction movie descent began as it dropped through temperatures equivalent to the surface of the Sun, along with a supersonic parachute inflation, and the first ever autonomous guided landing on Mars delivering the biggest, heaviest, cleanest, and most sophisticated six-wheeled robotic geologist ever launched into space north of the Martian equator.
The rover touched down at the ancient Jezero Crater, a 28 mile-wide impact crater (image below) that the site of home to the remains of an ancient river delta where researchers have found deposits of hydrated silica, a mineral that’s especially good at preserving microfossils and other signs of past life. ....

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