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    Hunting for Eclipses as Perfect as Earth’s

    Roughly twice a year, the apparent positions of Sun and Moon coincide, and a fortunate few observers are treated to a solar eclipse. Watching such an event provides the opportunity to contemplate a strange coincidence: From the surface of Earth, the apparent sizes of the Sun and Moon in the sky are nearly equal. The […]

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    Worlds Without End

    Think we might eventually travel to other planets? In a way, we already are.