Long before spacecraft visited the asteroid belt, astronomers searched the skies for the remnants of a lost planet. In May’s Backyard Astronomer, we explore the discovery of 4 Vesta—a massive protoplanet, survivor of the early Solar System, and one of the brightest asteroids visible from Earth. This month, Vesta rises alongside Saturn and Neptune in the pre-dawn sky, offering backyard astronomers a chance to track a world in motion.

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