Both reading and listening are talking about establishing colonies of humns to live in and work in asteroid.

Both reading and listening are talking about establishing colonies of humns to live in and work in asteroid. While the rading suggests that would be good idea, and support that with three reasons. The professor finds it not practical idea and have many downsize, then he cast doubt on each reason. To start with, according to the passage, the low gravity could be usefull for the landing and take off in term of saving fuel and the speed. On the other hand, the listening challenges this point by saying that low gravity has its certin risks like reducing the bone density and the muscle mass. This is what happend just for being in the space ship. As a result, more sever concequences could happened for staying for loger time. Secondly, the author posits that mining for valuable metal might be profitable by mining the precious metals and sending them back to earth. On the contrary, the lectuerer refuts this point by saying that this is not the whole picture. The cost might be high due to the additional cost of the extractiing and the fluctuation of the metal prices. Also there could be additional cost for the mining instuments. Finally, the passage claims that there is some of the asteroids are good option for colonization because they are close to earth, so they maybe eazy and affordable to get to and get back from. Contrastly, the professor does not believe that. He said that thy might be close, but there is no garntee that they will stay close. Some of the asteroida go far away, even more than March. As a consequences, returning back might be a big challeng.