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19 hours ago · History of gravitational theory. In physics, theories of gravitation postulate mechanisms of interaction governing the movements of bodies with mass. There have been numerous theories of gravitation since ancient times. The first extant sources discussing such theories are found in ancient Greek philosophy.
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19 hours ago · Mercury is the first planet from the Sun and the smallest in the Solar System. In English, it is named after the ancient Roman god Mercurius ( Mercury ), god of commerce and communication, and the messenger of the gods. Mercury is classified as a terrestrial planet, with roughly the same surface gravity as Mars.
Jun 1, 2024 · Explore the sites where Niels Bohr formed his ideas about atomic structure and quantum theory, and find out how he became part of the Manhattan Project, which made the atomic bomb. Then enjoy a day trip to the ancient city of Roskilde – now a centre for sustainable energy research.
19 hours ago · v. t. e. Nonmetals are chemical elements that mostly lack distinctive metallic properties. They range from colorless gases like hydrogen to shiny crystals like iodine. Physically, they are usually lighter (less dense) than metals; brittle or crumbly if solid; and often poor conductors of heat and electricity.
