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Two stars 19 light-years away are barely resolved by a 78 cm (mirror diameter) telescope. 1ly=9.461×10^15m....

Two stars 19 light-years away are barely resolved by a 78 cm (mirror diameter) telescope. 1ly=9.461×10^15m.

How far apart are the stars? Assume λ = 550 nm and that the resolution is limited by diffraction.

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