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Suppose that SETI researchers discovered a radio signal coming from a star in the direction of the ...

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Suppose that SETI researchers discovered a radio signal coming from a star in the direction of the ...

Suppose that SETI researchers discovered a radio signal coming from a star in the direction of the centre of the Milky Way that was about 10% closer to the centre than the Sun. If humans sent a reply to this signal immediately, and the aliens replied when they got our message, how long would it take before the alien reply reached Earth?

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a few years

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several decades

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thousands of years

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a few hundred years

Textbook

ASTRO

Edition: 3^rd

Authors: Ghose, Milosevic-Zdjelar, Read

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