[gluckmeea]

As I've always said, the best way to land on an asteroid is to harpoon it, like a whale, with a bungee cord between the craft and the asteroid. Then travel down the rope to the surface. That makes it relatively easy. Otherwise it's easy to fall off the asteroid.

Falling off an asteroid without a tether or power the problem is running out of supplies (food, water). In an asteroid-year your orbit will bring you back, but an asteroid-year is an exceptionally long time for a space walk.

> So, which asteroids are most profitable, valuable, easily accessible and cost effective?

I wonder how they would rate a cubic kilometre of Earth's crust?