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        How Big Is Our Universe?

        Astronomical distances can be difficult to comprehend. The star nearest to Earth, our Sun, is about 150 million kilometers (93 million miles) away. The next closest star system is about 4 light-years (4 x 1013 km or 2.5 x 1013 mi) away and the nearest galaxy is about 2 million light-years (2 x 1019 km or 1.2 x 1019 mi) away. This interactive resource from the the Harvard Smithsonian Center for Astrophysics illustrates the immense scale of the universe and demonstrates some techniques astronomers use to measure distances.

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