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Though asteroids are viewed as stepping stones in NASA's manned march to Mars, experts say such a mission may actually be a bigger challenge than putting humans on Mars itself
shahen Azawy's profile photoDorothy Kurtz's profile photoAntti Muhonen's profile photoMidlands Astronomy Club's profile photo
The gravity from an asteroid would be so minuscule  that it would be more like docking to an asteroid rather than 'landing' on it.  Performing an EVA would also be filled with all sorts of problems - the gravity might be strong enough to stand on an asteroid, but, unless it's a massive, moon-sized asteroid, an astronaut could probably launch his or herself into orbit around it just by leaping up and forward. They would need to be grappled to the surface at all times - making it restrictive, slow, and, from the public's perspectives - boring. Leave the asteroids to the asteroid miners, and instead - set up a permanent base on the moon.
The micro movements of an asteroid coupled with minimal gravity would make landing and extraction a huge challenge. You could literally bounce off the asteroid. 
Or worse than bounce, shatter bits and pieces off of it and have to deal with a debris filled environment until everything settles or escapes.
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