🔬 Discovery

Lunar mountains and craters

Montañas y cráteres de la Luna

Date
1609 · confidence high
Place
Padua, Republic of Venice, Italy
Credited to
Galileo Galilei
People
👤 Galileo Galilei1564–1642
Field
Cosmos & Earth

⚠️ Disputed: the sources disagree.

What was discovered

With his telescope Galileo saw that the Moon has mountains, valleys and craters, and measured their height from their shadows. The Moon was a world like the Earth, not a perfect sphere.

Thomas Harriot had drawn the Moon through a telescope months earlier in England, without publishing it.

What it led to

  • Selenography
  • Breakdown of the sky-Earth divide
  • Sidereus Nuncius and telescopic astronomy
🕸️ View in the graph

Built on

Made possible

📄 Original publication

Sidereus nunciusGalileo Galilei · 1610

Links

Sources✓ verified 2026-09-25