The researchers surveyed and evaluated this by analyzing chlorine isotopes found in lunar rock samples from Apollo missions. The range of chlorine (氯) isotopes in lunar samples was 25 times that found in samples from Earth.

　　“If the Moon had significant levels of hydrogen, as Earth did, this range would have been far less,” said Zachary D. Sharp, a scientist in the Department of Earth and Planetary Sciences and the study’s lead author.

　　“The chlorine would have stuck together with hydrogen, forming compounds like hydrogen chloride, and escaped from the Moon’s surface,”he said. The abundance of chlorine indicates a lack of hydrogen and water.

　　“The amount of water on the Moon was way too low for life to have ever have possibly have existed there,” he said.

　　Most scientists believe the Moon was formed when a large object struck Earth, breaking off a chunk (a vast piece) that has since orbited Earth.

　　On Earth, goes one theory, water was released as steam from molten basalts (玄武岩) over time, eventually forming bodies of water.

　　“An understanding of whether the Moon was dry or wet will help us understand how water appeared on Earth,” Dr. Sharp said.

　　1. A new study indicates that　on the moon.

　　A. there is plenty of water

　　B. water is unlikely to exist

　　C. water existed in the past

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