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Callisto is the second-largest moon of Jupiter, after Ganymede. It is the third-

1 minute ago

Callisto is the second-largest moon of Jupiter, after Ganymede. It is the third-largest moon in the Solar System after Ganymede and Saturns largest moon Titan, and the largest object in the Solar System not to be properly differentiated. Callisto was discovered in 1610 by Galileo Galilei. At 4821 km in diameter, Callisto has about 99% the diameter of the planet Mercury but only about a third of its mass. It is the fourth Galilean moon of Jupiter by distance, with an orbital radius of about 1883000 km. It is not in an orbital resonance like the three other Galilean satellites—Io, Europa, and Ganymede—and is thus not appreciably tidally heated. Callistos rotation is tidally locked to its orbit around Jupiter, so that the same hemisphere always faces inward; Jupiter appears to stand nearly still in Callistos sky. Callisto is composed of approximately equal amounts of rock and ices, with a density of about 1.83 g/cm3, the lowest density and surface gravity of Jupiters major moons. Compounds detected spectroscopically on the surface include water ice, carbon dioxide, silicates, and organic compounds. Investigation by the Galileo spacecraft revealed that Callisto may have a small silicate core and possibly a subsurface ocean of liquid water at depths greater than 100 km. ⚠️News come from Wikipedia. #callisto #satellites #jupiter #planet #earth #sun #stars #moon #mercury #mars #venus #science #space #universe #astronomy #passion #knowledge
A neutrino(denoted by the Greek letter ν) is a fermion (an elementary particle w

6 minutes ago

A neutrino(denoted by the Greek letter ν) is a fermion (an elementary particle with half-integer spin) that interacts only via the weak subatomic force and gravity.The mass of the neutrino is much smaller than that of the other known elementary particles.Although only differences of squares of the three mass values are known as of 2016, cosmological observations imply that the sum of the three masses must be less than one millionth that of the electron.The neutrino is so named because it is electrically neutral and because its rest mass is so small that it was long thought to be zero. The weak force has a very short range, gravity is extremely weak on the subatomic scale, and neutrinos, as leptons, do not participate in the strong interaction.Thus, neutrinos typically pass through normal matter unimpeded and undetected. Neutrinos are created by various radioactive decays, including in beta decay of atomic nuclei or hadrons, nuclear reactions such as those that take place in the core of a star or artificially in nuclear reactors, nuclear bombs or particle accelerators,during a supernova,in the spin-down of a neutron star or when accelerated particle beams or cosmic rays strike atoms.The majority of neutrinos in the vicinity of the Earth are from nuclear reactions in the Sun. In the vicinity of the Earth, about 65 billion solar neutrinos per second pass through every square centimeter perpendicular to the direction of the Sun. For study, neutrinos can be created artificially with nuclear reactors and particle accelerators.There is intense research activity involving neutrinos, with goals that include the determination of the three neutrino mass values,the measurement of the degree of CP violation in the leptonic sector (leading to leptogenesis); and searches for evidence of physics beyond the Standard Model of particle physics, such as neutrinoless double beta decay, which would be evidence for violation of lepton number conservation.Neutrinos can also be used for tomography of the interior of the earth. Reference- Mertens,Susanne (2016).Direct neutrino mass experiments.Journal of Physics #theworldofscience #science #astronomy #neutrinos #space #physics
Successful launch of the GSLV Mk III rocket carrying the GSAT29 into GTO. Here y

7 minutes ago

Successful launch of the GSLV Mk III rocket carrying the GSAT29 into GTO. Here you got some images of the launch! Image credit: ISRO #space #galaxy #astronomy #universe #rocket #rocketlaunch #stars #milkyway #science #astronaut #nightsky #moon #planet #natgeospace #nebula #космос #hubble #earth #solarsystem #universetoday #iss #dragon #bfr #mars #planets #nasa #spacex #elonmusk
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