Scientists sent sounds to the moon. These sounds bounced off the moon like an echo bounces off a wall. The scientists wanted to see how strong the echo was. The echo was not very strong. This means that there is not much water on the moon. Scientists are upset, because they wanted to find water. With water, they said, people might have been able to live on the moon in the future.
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This was a(n) _________ discovery.
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A expensive
B frightening
C disappointing
D pleasant
1 answer
C disappointing