Gordon knows that the only hope of saving X-7 is to lower its interior temperature to below zero degrees. The fungus inside X-7 dies, but it is now growing on the outside of the space station. No one can understand why the fungus is spreading on X-7's exterior until one of Knowland's staff officers says that it must be due to the "high temperatures generated by the unshielded blazing sun" beating down on X-7. This gives Knowland the idea of launching a rocket that will explode and form a huge cloud of ice crystals for X-7 to pass through.
