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mercury-is-a-rocky-body-like-earth-it-is-the-smallest-planet-in-the-solar-system-with-an-equatorial-radius-of-24397-kilometres-15160-mi
most-of-the-stars-in-the-universe-including-all-stars-outside-our-galaxy-the-milky-way-are-invisible-to-the-naked-eye-from-earth
on-february-81974-after-84-days-in-space-the-crew-of-skylab-4-the-last-crew-to-visit-american-space-station-skylab-returns-to-earth
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