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The planet Jupiter has 67 confirmed moons. This gives it the largest retinue of moons with "reasonably secure" orbits of any planet in the Solar System. The most massive of them, the four Ga ...
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Iridium is the chemical element with symbol Ir and atomic number 77. A very hard, brittle, silvery-white transition metal of the platinum family, iridium is the second-densest element (after osmium) a ...
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Peñón de Alhucemas (Spanish pronunciation: [peˈɲon de aluˈθemas], "Lavender Rock") is one of the Spanish plazas de soberanía just off the Moroccan coast in the Alboran Sea. It is also one of ...
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Geography (from Greek ?e???af?a, geographia, lit. "earth description") is a field of science dedicated to the study of the lands, the features, the inhabitants, and the phenomena of the Eart ...
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Earth's outer core is a liquid layer about 2,266 km (1,408 mi) thick composed of iron and nickel that lies above Earth's solid inner core and below its mantle. Its outer boundary lies 2,890 km ...
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The mantle is a part of a terrestrial planet or other rocky body large enough to have differentiation by density. The interior of Earth, similar to the other terrestrial planets, is chemically divided ...
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The Lehmann discontinuity refers to an abrupt increase of P-wave and S-wave velocities at the depth of 220±30 km, discovered by seismologist Inge Lehmann. It appears beneath continents, but not usuall ...
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Earth's inner core is Earth's innermost part and is a primarily solid ball with a radius of about 1,220 km (760 mi), according to seismological studies. (This is about 70% of the Moon's ra ...
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Seismology (/sa?z'm?l?d?i/; from Greek se?sµ?? "earthquake" and -????a "study of") is the scientific study of earthquakes and the propagation of elastic waves through the Earth or ...
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As seen from the Earth, a solar eclipse is a type of eclipse that occurs when the Moon passes between the Sun and Earth, and the Moon fully or partially blocks ("occults") the Sun. This can ...
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