NASA’s midlife crisis

NASA is looking for a rock. It has to be out there somewhere — a small asteroid circling the sun and passing close to Earth. It can’t be too big or too small. Something 20 to 30 feet in diameter would work. It can’t be spinning too rapidly, or tumbling knees over elbows. It can’t be a speed demon. And it shouldn’t be a heap of loose material, like a rubble pile.

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  Reported by Washington Post 15 hours ago.