Hubble, Edwin Powell
His observation in 1929 that the universe is expanding at a constant rate led to the conclusion that the Universe originated in a Big Bang, thousand of millions of years in the past.
He was a naturalist, botanist, zoologist, author, cartographer, artist and sociologist. He also researched mineralogy, astronomy and forestry and explored areas from Latin America to the Urals and Sibiria.
Alexander von Humboldt was once described as the 'last universal scholar in the field of the natural sciences'.
In the Americas Humboldt's influence is much more prevalent than in Germany. There are at least eight townships throughout North America named Humboldt City.
His popular lectures were an important factor in the acceptance of the theory of evolution by both scientists and the public. He also wrote many scientific papers, one of which led to the formulation of the zoological class Hydrozoa.
Huyghens founded the wave theory of light and invented the pendulum clock. Early on he improved the telescope and discovered the true shape of the rings of Saturn. The need for acurate timepieces in the field of astronomy prompted him to improve the accuracy of clocks.
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