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Aristotle presented evidence for a spherical Earth.

Nicolaus Copernicus formulated a heliocentric model of the solar system.

Apollo 11 landed the first humans on the Moon.

Isaac Newton published 'Principia Mathematica', formulating the laws of motion and universal gravitation.

Galileo Galilei made improvements to the telescope.

Copernicus published his heliocentric theory.

Johannes Kepler proposed the laws of planetary motion.

William Herschel discovered the planet Uranus.

Discovery of Neptune based on predictions by Urbain Le Verrier.

Giordano Bruno proposed an infinite universe with a multitude of worlds.

Edwin Hubble discovered that the universe is expanding.

Clyde Tombaugh discovered Pluto.

The discovery of thousands of exoplanets.

Huygens probe landed on Saturn's moon Titan.

Albert Einstein published the general theory of relativity.

Galileo Galilei discovered the Galilean moons of Jupiter.

Yuri Gagarin became the first human in space.

NASA's Spirit Rover landed on Mars.

The International Astronomical Union redefined the term 'planet', which led to the reclassification of Pluto.