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Proposed the Heliocentric model of the universe.

Made pioneering observations that supported the Copernican theory.

Formulated the three laws of planetary motion.

Developed the law of universal gravitation and the three laws of motion.

Demonstrated the expansion of the universe.

Made precise astronomical observations that were the basis for Kepler's laws.

Popularized science and astronomy through books and the television series 'Cosmos'.

Predicted the return of the comet that was later named after him.

Proposed the Big Bang theory of the origin of the universe.

Discovered the planet Uranus and infrared radiation.

Developed the Harvard Classification Scheme, organizing stars based on their temperatures.

Discovered that stars are composed mainly of hydrogen and helium.

Discovered the relation between the luminosity and the period of Cepheid variable stars.

Formulated the Chandrasekhar limit, the maximum mass of a stable white dwarf star.

Proposed the existence of dark matter and neutron stars.

One of the earliest known astronomers, credited with the invention of trigonometry.

Discovered the first radio pulsars in 1967.

Discovered cosmic radio waves and is considered the father of radio astronomy.

Confirmed the existence of dark matter through her work on galaxy rotation rates.

Provided the first empirical test of Einstein's theory of general relativity.

Pioneered techniques for the discovery of exoplanets in the region of their host stars known as the habitable zone.

Known for discovering many trans-Neptunian objects (TNOs), including the dwarf planet Eris.

Discovered four moons of Saturn and the gap in Saturn's rings known as the Cassini Division.

Created a common designation system for stars and discovered the Horsehead Nebula.