Galileo

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Galileo's telescopes

Galileo's illustrations of the Moon

Galileo Galilei: Copernican system

Aristotle's theory of the solar system explained

Galileo Galilei: sunspots

German mathematician Christoph Scheiner.

Why was Galileo persecuted for his discoveries?

frontispiece to Galileo's Dialogue Concerning the Two Chief World Systems, Ptolemaic & Copernican

Astronomers Monument

For Students

Galileo

Galileo (Galilei) summary

Galileo

Galileo Timeline

Galileo

Galileo’s Achievements

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Galileo: Facts & Related Content

Written and fact-checked by The Information Architects of Encyclopaedia Britannica

Facts

Also Known As	Galileo Galilei
Born	February 15, 1564 • Pisa • Italy
Died	January 8, 1642 (aged 77) • Italy
Inventions	Galilean telescope • hydrostatic balance • thermometer • compass
Notable Works	“Dialogue Concerning the Two Chief World Systems—Ptolemaic and Copernican” • “The Sidereal Messenger”
Notable Family Members	father Vincenzo Galilei
Subjects Of Study	Jupiter • Milky Way Galaxy • Pleiades • Sun • Copernican system • Galilean satellite • Galilean transformations • gravity • motion • planet • Solar System • sunspot • pendulum

Did You Know?

Galileo constructed his famous telescope without having seen an example of the Dutch instruments.
Galileo designed a new form of hydrostatic balance, an instrument for weighing objects using air and water.

Photos and Videos

Galileo's telescopes

Galileo's illustrations of the Moon

Galileo Galilei: Copernican system

Galileo Galilei: sunspots

German mathematician Christoph Scheiner.

frontispiece to Galileo's Dialogue Concerning the Two Chief World Systems, Ptolemaic & Copernican

Astronomers Monument

Aristotle's theory of the solar system explained

Why was Galileo persecuted for his discoveries?

How the barometer was invented

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