![]() They were surprised to hear the same low, static hiss wherever they aimed it. ![]() In 1964, two scientists in New Jersey, Arno Penzias and Robert Wilson, aimed a new, extra-sensitive radio antenna at outer space to discover what they could hear. In 1929, astronomer Edwin Hubble made observations from a powerful telescope showing that galaxies sped away from each other at an ever-increasing velocity. When the theory of an expanding Universe was first proposed by Georges LemaƮtre in the 1920s even the great physicist Einstein did not believe it. In Big History, we call this process of gathering evidence that supports a theory or idea "claim testing." ![]() ![]() It took decades from the time a few scientists proposed that the Universe was expanding until the point where the Big Bang hypothesis was generally accepted.
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