Who were key scientists who helped in the growth of Astronomy? What did they discover?

Nicolaus Copernicus was a key scientist in the growth of Astronomy, who proposed a heliocentric model of the universe where the sun was at the centre.

Galileo Galilei was an Italian astronomer who used a telescope to observe the sky and was the first to observe the moons of Jupiter.

Johannes Kepler was a German astronomer who formulated three laws of planetary motion which described how planets move around the sun.

Isaac Newton was an English scientist who proposed the law of universal gravitation which states that every object in the universe attracts every other object with a force proportional to their masses.

Edmond Halley was an English astronomer who predicted the orbits of comets and was the first to observe the periodic comet now named after him.

William Herschel was a German-British astronomer who discovered the planet Uranus and two of its moons.

Edwin Hubble was an American astronomer who discovered that the universe is expanding and proposed the Hubble’s law.

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