is nasa doing right by sending rocket and making a small blasts on moon?

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is nasa doing right by sending rocker and making a small blasts on moon for finding water? actually nasa is sending a rocket and will make a blasts on moon which will actually makes a 5 kms hole on the moon's surface so that to know that is there water on moon.it will send its rocket after oct 2008. so do u think its correct or wrong plz give ur response