Disadvantages
- Low gravity. Humans would have to adapt, or some form of artificial gravity would have to be implemented.
- Most asteroids are far from the Sun. The asteroid belt is roughly 2 to 4 times further from the Sun than Earth. This means that the available solar energy (solar constant) is 4 to 16 times lower than it is at Earth orbit.
- Many asteroids may merely be loose agglomerations of dust and rocks, which may be very difficult to use.
- Asteroids are vulnerable to solar radiation, lacking features functionally comparable to Earth's ozone layer and magnetosphere (though some may have a magnetic field, they are bound to be considerably weaker by comparison).
- Asteroids have no atmosphere.
- Smaller objects may collide with the asteroid and cause significant damage.
Read more about this topic: Colonization Of The Asteroids