It would be the first step in colonizing space – the moon is preferential to Earth as a base for investigating life elsewhere in the universe  Colonizing the Moon should not be seen as an end goal in and of itself but rather a platform for reaching out further into the universe. The moon makes a better base than Earth for a number of reasons.  Any civilization that is serious about space exploration would probably have to start with the moon. It’s a comparatively simple mission which would allow us to learn the pitfalls and problems while staying within a few days of earth.  The moon also provides a better base for SETI than Earth as Radio telescopes on the far side of the moon would be shielded from the interference of Earth. Equally the Moon’s slow rotation would allow light-based observatories to undertake experiments lasting for days at a time.  Most experts are agreed that it is statistically unlikely that Earth is the only life-bearing planet, to date we have not been serious investigating this issue despite the enormous implications it has for almost every area of human thought and activity.