NASA's New Horizons mission has answered one of the most basic questions about Pluto—how big is it? Mission scientists have found Pluto to be 1,473 miles in diameter, somewhat larger than many prior ...
Mercury is the smallest planet in our solar system. Explore its size, extreme temperatures, core structure, and comparison with Pluto.
Alas, poor Pluto, the dissing just keeps on coming. Last year, the erstwhile ninth planet was demoted because astronomers had discovered a nearby object, now officially named Eris, that was larger in ...
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