Alexandre Gomes
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Black Hole Blues and Other Songs from Outer Space, by Janna Levin

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measures the length of the course. If the light travel time is a little longer, the distance between the mirrors has stretched. If the light travel time is a little shorter, the distance between the mirrors has squeezed.
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Black Hole Blues and Other Songs from Outer Space
Black Hole Blues and Other Songs from Outer Space
by Janna Levin
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