NASA narrows asteroids to visit to three


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NASA officials have reviewed the list of Near Earth Objects and found only three that meet all the constraints for a manned mission. Key quote:

Out of the 44 reachable asteroids, 27 were too small, and only 15 have orbits that allow for exploration between 2020 and 2050 — the timeframe NASA wants to pursue for NEO missions. The 180-day mission constraint further cuts the list to three.

It must also be noted that none of these asteroids are reachable without a heavy-lift rocket like the Ares V.

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