What makes the trip to Mars especially dangerous for astronauts, as explained in "Danger! This Mission to Mars Could Bore You to Death!" Powering the spacecraft requires advance technology.

The trip takes more than eight months each way.

Getting supplies to the astronauts is not easy.

Deep space is too cold fo be comfortable.

motivation

awnser:

jem is "moody and silent" after the pants incident. the new school year starts, and scout finds second grade just as boring as first. one day, she and jem are walking home together when jem reveals that when he found his pants that night, they were all folded up, and the tears had been crudely sewn up, as if someone knew that he would be coming back for them. he finds this highly eerie. then, they find a ball of twine in the radley oak tree knothole. again, they aren't sure if it is a gift for them or not, so they leave it for a few days. when it remains in the hole for a few days, they take it, and decide that anything left there is okay to take.