Asteroids are large space objects made of rock and ice There are hundreds of thousands of asteroids in our solar system Though we often hear ideas about establishing colonies of humans to live and work on our Moon or our neighboring planet Mars some think v.2

The lecture challenges the specific arguments presented in the reading passage basically by these three following points. To work against the first argument that the low gravity asteroids maintains are often beneficial, the professor suggested that low gravity presents risks sometimes for causing people losing muscle weight and bones density. Especially in the case of long-term staying. And second, to disapprove the thought that profitable mining businesses, the whole picture should be considered as the cost of establishing a mining industry and setting up the transport are extremely high so that can come over than the profits this will make. On the other hand, if there is some other valuable metal resource found in Earth, the supplies increase, the price reduces. At last, for the argument that those asteroids are easy to reach. It is true in a way, but it also can be much harder to come back somehow. Those asteroids comes close to the Earth, and at some points, they move far away, even further than the distance of Mars. Thus, our people may reach easily but take a huge mount of efforts to come back home.