Its Brightness Swung by a Factor of Ten

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The second problem was its shape. The object was too far away to image directly, so its shape had to be inferred from how its brightness changed as it tumbled. And the brightness varied enormously, by a factor of about ten, on a cycle of roughly eight hours.

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The brightness swung wildly
The brightness swung wildly
Far longer than it was wide
Far longer than it was wide

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Its Brightness Swung by a Factor of Ten