Scientists say the rock was created very early in the life of the moon.

VOA: special.2009.07.29

But,other countries have not. Critics of Mr.Obama's plan say not returning to the Moon could jeopardize America's leadership in space exploration.

VOA: standard.2010.04.21

"Why should we do something when we've already done it." "Going to the moon or going to Mars is about as interesting to people as say going to Antarctica."

VOA: standard.2010.04.15