What is the main idea of the passage?
A Astronomers now feel certain that no life exists on the surface of any other planet in our solar system.
B It is realistic to send a spacecraft far beyond our solar system to search for E.T. life.
C There is no E.T. life on Mars.
D Using radio telescopes to listen out for message from E.T. life, scientists have discovered that the new equipment nay help in the development of new communication and medical technologies.
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