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Strontium was first isolated as a metal in 1808 by Humphry Davy using the then newly discovered process of electrolysis. During the 19th century, strontium was mostly used in the production of sugar from sugar beets (see strontian process ).
The ideal formula of strontianite is SrCO 3, with molar mass 147.63 g, [4] but calcium (Ca) can substitute for up to 27% of the strontium (Sr) cations, and barium (Ba) up to 3.3%. [2] The mineral was named in 1791 for the locality, Strontian, Argyllshire, Scotland, where the element strontium had been discovered the previous year. [2]
First animals in space (fruit flies). United States V-2 [4] [6] 24 February 1949: First two-stage liquid-fueled rocket, that sets a record altitude of 244 miles (393 km) (WAC Corporal missile mounted onto a V-2 rocket). United States Bumper-5: 14 June 1949: First mammal in space (Albert II, a rhesus monkey). First primate in space. United ...
The two discovered a new element in a molybdenum sample that was used in a cyclotron, the first element to be discovered by synthesis. It had been predicted by Mendeleev in 1871 as eka-manganese. [171] [172] [173] In 1952, Paul W. Merrill found its spectral lines in S-type red giants. [174]
Space exploration is the use of astronomy and space technology to explore outer space. [1] While the exploration of space is currently carried out mainly by astronomers with telescopes , its physical exploration is conducted both by uncrewed robotic space probes and human spaceflight .
Scientists recently discovered that the merger and collapse of two neutron stars makes an almost perfectly spherical explosion.
700 BC: Pell's equations are first studied by Baudhayana in India, the first diophantine equations known to be studied. [19] 700 BC: Grammar is first studied in India (note that Sanskrit Vyākaraṇa predates Pāṇini). [20] 600 BC: Thales of Miletus is credited with proving Thales's theorem. [21] [22] [23]
First discovered 80 years ago in 1945, Promethium is a lanthanide (one of a series of 15 metallic chemicals also known as rare earth metals) with the atomic number 61, and in the following eight ...