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Astronomical objects discovered in 1610
Ganymede (moon)Ganymede is larger than the planet Mercury, yet it possesses less surface gravity than Earth's own Moon. This paradox defines the moon's unique identity as…
Io (moon)Io is the most volcanically active world in the entire Solar System, a title that sets it apart from every other known celestial body.
Astronomical objects discovered in 1610 | HearLore