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Neon is a chemical element; it has the symbol Ne and atomic number 10. It is the second noble gas in the periodic table. [13] Neon is a colorless, odorless, inert monatomic gas under standard conditions, with approximately two-thirds the density of air. Neon was discovered in 1898 alongside krypton and xenon, identified as one of the three ...
The timeline of discovery of Solar System planets and their natural satellites charts the progress of the discovery of new bodies over history. Each object is listed in chronological order of its discovery (multiple dates occur when the moments of imaging, observation, and publication differ), identified through its various designations (including temporary and permanent schemes), and the ...
Stellar nucleosynthesis. In astrophysics, stellar nucleosynthesis is the creation of chemical elements by nuclear fusion reactions within stars. Stellar nucleosynthesis has occurred since the original creation of hydrogen, helium and lithium during the Big Bang. As a predictive theory, it yields accurate estimates of the observed abundances of ...
December 26 – Marie and Pierre Curie announce discovery of a substance they call radium. It is the only moment where 5 elements are discovered the same year. Emil Fischer synthesizes purine. Richard Willstätter analyzes the structure of the cocaine molecule in a synthesis derived from tropinone.
e. The Franck–Hertz experiment was the first electrical measurement to clearly show the quantum nature of atoms. It was presented on April 24, 1914, to the German Physical Society in a paper by James Franck and Gustav Hertz. [1][2] Franck and Hertz had designed a vacuum tube for studying energetic electrons that flew through a thin vapor of ...
This is a timeline of Solar System exploration ordering events in the exploration of the Solar System by date of spacecraft launch. It includes: All spacecraft that have left Earth orbit for the purposes of Solar System exploration (or were launched with that intention but failed), including lunar probes. A small number of pioneering or notable ...
In the Andromeda Galaxy, roughly 25 novae brighter than about 20th magnitude are discovered each year, and smaller numbers are seen in other nearby galaxies. [12] Spectroscopic observation of nova ejecta nebulae has shown that they are enriched in elements such as helium, carbon, nitrogen, oxygen, neon, and magnesium. [2]
First mammal in space (Albert II, a rhesus monkey). First primate in space. United States V-2: 22 July 1951: First dogs in space (Dezik and Tsygan). First living organisms to fly in space and safely return. USSR Soviet space dogs [7] 20 September 1956: First rocket to pass the thermopause and enter the exosphere. At 682 miles (1,098 km ...