The earth is so big, why do people go to space?

1. There are more and more people on the earth, and resources and energy can't meet the demand more and more, but the population will keep growing (except in special circumstances);

2. The human spirit of exploring the unknown world, the desire to grasp the environment and the desire for possession, of course, make us not satisfied with staying on this earth that is great for individuals and small for the universe;

3. Going into space and conquering the extremely bad conditions will probably bring people more satisfaction than anything that can be achieved on earth. ...