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Waves mean big step forward

作者:21st
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SINCE Italian astronomer Galileo Galilei pointed his telescope for the first time at the sky, humans have been exploring the universe through different tools (工具). On Feb 11, another amazing tool that can find gravitational waves (引力波) was announced by a group of scientists from the Laser Interferometer Gravitational-Wave Observatory (LIGO) in the US.
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