It greatly benefits the economy. It will open up many jobs for scientists, engineers etc. It also inspires today's children to become scientists/engineers. You should check out videos of Neil deGrasse Tyson on youtube where he explains why space exploration is so important.
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You asked one extremely general question vis a vis gravitation.
Come on. YOU need to do some of the thinking too.
Come on. YOU need to do some of the thinking too.