What is the greatest challenge facing space programs that are trying to send human beings to other planets? Providing activities that will decrease boredom and depression on such a long journey away from Earth.

Providing enough rocket fuel to propel a space craft far enough to reach other planets.

Providing medicine that will prevent death resulting from exposure to a zero gravity environment.

Providing the resources necessary for sustaining human life on such a long journey. What is the greatest challenge facing space programs that are trying to send human beings to other planets?

Providing activities that will decrease boredom and depression on such a long journey away from Earth.

Providing enough rocket fuel to propel a space craft far enough to reach other planets.

Providing medicine that will prevent death resulting from exposure to a zero gravity environment.

Providing the resources necessary for sustaining human life on such a long journey.