First of all space exploration is not worth the cost because it is not worth losing the lives astronauts lives. Even though there are people willing to go to space they can lose their lives while leaving the atmosphere. An example is the 1986 challenger tragedy. There was also another space shuttle tragedy in 2003 the space shuttle Columbia exploded just a few after lift off killing all of the crew members.
Another reason why space exploration is not worth the cost is because of how much it costs