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1 giorno fa · Nuclear fusion is a reaction in which two or more atomic nuclei, usually deuterium and tritium (hydrogen isotopes ), combine to form one or more different atomic nuclei and subatomic particles ( neutrons or protons ). The difference in mass between the reactants and products is manifested as either the release or absorption of energy.
13 ore fa · The solar model that was constructed out of these studies indicated that the solar neutrino problem discussed in Chap. 9 is actually a problem related to particle physics. Efforts to observe solar-like, i.e. p-mode vibrations in other stars succeeded for the first time in 1991 when the sub-giant Procyon was found to pulsate with a mean frequency 0.9 mHz and rms amplitude 2.5 ms \(^{-1}\) [ 7 ].
13 ore fa · Etymology The English word sun developed from Old English sunne. Cognates appear in other Germanic languages, including West Frisian sinne, Dutch zon, Low German Sünn, Standard German Sonne, Bavarian Sunna, Old Norse sunna, and Gothic sunnō. All these words stem from Proto-Germanic * sunnōn. This is ultimately related to the word for sun in other branches of the Indo-European language ...
1 giorno fa · In gamma-ray astronomy, gamma-ray bursts ( GRBs) are immensely energetic explosions that have been observed in distant galaxies, being the brightest and most extreme explosive events in the entire universe, [1] [2] [3] as NASA describes the bursts as the "most powerful class of explosions in the universe". [4]
5 giorni fa · The program in muon and neutrino physics: Super beams, cold muon beams, neutrino factory and the muon collider, Rajendran Raja et al. (Neutrino Factory and Muon Collider), arXiv:hep-ex/0108041, 2001. APS / DPF / DPB Summer Study on the Future of Particle Physics (Snowmass 2001), Snowmass, Colorado, 30 June - 21 Jul 2001. [NeutrinoFactory:2001lkl]
3 giorni fa · Solar cycle, period of about 11 years in which fluctuations in the number and size of sunspots and solar prominences are repeated. Solar cycle 25 began in 2019 and will reach maximum in 2025, but that maximum is predicted to be weak, like that of solar cycle 24.
4 giorni fa · An energy company that offers round-the-clock power is bringing day to night with technology that originated from the Massachusetts Institute of Technology.. In late April, MIT News detailed how 247Solar's high-temperature concentrated solar power systems could support a transition to a clean-energy grid by ensuring that power is readily available when people need it.
