Galileo’s Historic Sketch of the Pleiades Star Cluster #1895579 (License: Personal Use)

This historical illustration reproduces Galileo Galilei’s 1610 telescopic observations of the Pleiades star cluster, where he identified many fainter stars beyond the six or seven visible unaided. His meticulous sketch-showing stars of varying sizes and positions-demonstrated the power of the telescope and challenged ancient astronomical models. The drawing is preserved in his manuscript *Sidereus Nuncius* (Starry Messenger), a foundational text in modern observational astronomy.

Used in educational, historical, and astronomy-focused web pages to illustrate the birth of modern telescopic astronomy; matches user intent for learning about Galileo’s contributions, the Pleiades, or early scientific documentation.