Hans Lippershey created the first telescope He was a German-Dutch lens maker.
Galileo uses telescope for astronomical observations. He carried out observations of the moon, sun, planets and stars.
Edmund Halley discovers that stars move through space. He found that the positions of stars change through time and explained that these changes are due to the individual motion of stars through space.
William Herschel discovers Uranus while measuring the direction and brightness of the stars. He was searching for binary stars when he discovered a fuzzy disk in his telescope and suspected it could be a comet.
The Coriolis effect was discovered by Gaspar De Coriolis. The apparent deflection of moving bodies due to earths rotation, explained many atmospheric circulation patterns. The Coriolis effect is the result of Earth's rotation on weather and patterns and ocean currents.
Albert Einstein explains the photoelectric effect. He explains that the emission of electrons only by light at short wavelengths occurs because light consists of bundles of energy called photons. Production of electrons when light is shone onto a material.
Alfred Wegener proposes continental drift. Wegener noted the similarity of rocks on opposite sides of the Atlantic Ocean and proposed that the present continents had been part of a super-continent that broke apart about 200 million years ago.
Clyde Tombaugh discovered Pluto by comparing photographic plates taken of the same region of the sky about a week apart.
Horace Babcock proposes model of sunspot cycle. His model involved the twisting of solar magnetic field lines because the rate of solar rotation varies with solar latitudes.
Astronauts Edwin Aldrin and Neil Armstrong land on the Moon. They are the first people to land on the Moon.
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