Fr.: ceinture des astéroïdes
The region of the → solar system located between → Mars and → Jupiter where over a million objects bigger than 1 km across orbit the Sun. Another region populated by minor bodies lies beyond the orbit of → Neptune, the → Kuiper belt.
O.E. belt, from P.Gmc. *baltjaz, from L. balteus "girdle;" → Orion.
Kamarband "belt," from kamar "waist" (Mid.Pers. kamar "waist; belt, girdle," Av. kamarâ- "belt") + band "a band, tie, belt."
Belt of Orion
kamarband-e Šekârgar, ~ Orion
Fr.: Baudrier d'Orion
Belt of Venus
Fr.: Ceinture de Vénus
A pink to brownish border above the horizon separating the Earth's dark shadow on the sky from the sky above it. The Belt of Venus appears during a cloudless twilight just before sunrise or after sunset. It is due to scattered red sunlight in the atmosphere. Also called anti-twilight arc.
kamarband-e Gould (#)
Fr.: ceinture de Gould
A band of hot, young stars (O and B types) and molecular clouds that stretches around the sky. It is tilted by about 20 degrees with respect to the Galactic plane, and has a diameter of about 3000 light-years.
Named after the American astronomer Benjamin A. Gould (1824-1896), who discovered it in 1879 by studying the distribution of the nearest luminous stars in space; → belt.
kamarband-e Kuiper (#)
Fr.: ceinture de Kuiper
A region of the → Solar System extending roughly from the orbit of → Neptune, or 30 → astronomical units (AU), to 50 AU from the Sun that contains many small icy bodies. The Kuiper belt is now considered to be the source of the → short-period comets.
Named after Gerard Peter Kuiper (1905-1973), a Dutch-born American astronomer, who predicted the belt in 1951. He is also considered the father of modern planetary science for his contributions to the study of our solar system; → belt.
Kuiper belt object (KBO)
barâxt-e kamarband-e Kuiper
Fr.: objet de la ceinture de Kuiper
Fr.: ceinture principale
kamarband-e Šekârgar, ~ Orion
Fr.: Ceinture d'Orion
Three prominent stars in the central regions of the constellation → Orion that align to form the "belt" of the mythological Hunter. They are → Alnitak, → Alnilam, and → Mintaka. The easternmost star Alnitak is separated from the middle one, Alnilam, by 1°.36, and the westernmost Mintaka has an angular distance of 1°.23 from Alnilam. Their distance is between 800 and 1,300 light-years from Earth. They probably formed inside the same molecular cloud less than 10 million years ago.
kamarband-e tâbeš (#), ~ tâbeši (#)
Fr.: ceinture de radiations
A ring-shaped region in the → magnetosphere of a planet in which charged particles are trapped by the planet's magnetic field. The radiation belts surrounding Earth are known as the → Van Allen belts.
Van Allen belts
kamarbandhâ-ye Van Allen
Fr.: ceintures de Van Allen
The ring-shaped regions of charged particles surrounding the Earth from 1 to 6 Earth radii into space. The charged particles are trapped in by the Earth's magnetic field. The inner belt is between 1.2 and 4.5 Earth radii and contains high-energy electrons and protons which originate mainly from interactions between cosmic rays and the upper atmosphere. The outer belt, located between 4.5 and 6.0 Earth radii, contains lower-energy charged particles mainly coming from the solar wind.
Named after James Van Allen (1914-2006), who discovered the belts in 1958 based on measurements made by Explorer 1, the USA's first successful artificial satellite; → belt.