On January 7, 1610, Galileo Galilei observed what appeared to be three stars near Jupiter, which he soon realized were objects orbiting the planet. Within weeks, he identified four moons—Io, Europa, Ganymede, and Callisto—the first moons ever discovered orbiting another planet. These observations supported Galileo’s belief in a heliocentric solar system and challenged the long-held belief that Earth was the center of the universe. Though his discoveries advanced modern astronomy, they led to decades of persecution, a trial by the Inquisition, and lifelong house arrest. Today, Galileo’s work shapes our understanding of the solar system and reminds us of the wonders of God’s creation.

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