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Asteroids help scientists measure distant stars

We gaze up at them, we wish upon them, we even sing about swinging on them. But the one thing we haven't been able to do with a star is figure out how big it is...until now.
We gaze up at them, we wish upon them, we even sing about swinging on them. But the one thing we haven't been able to do with a star is figure out how big it is...until now.

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