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Astronomy 1021

Ch. 1

TermDefinition
Field of view The area visible in an image. Usually given as the diameter of the region.
Scientific notation The system of recording very large or very small numbers by using power of 10.
Astronomical Unit Average distance from Earth to the Sun; 1.5 x 10^8 kilometres.
Solar system The sun and its planets, asteroids, comets, and so on.
Planet A non-luminous body in orbit around a star, large enough to be spherical and to have cleared its orbital zone of other objects.
Star A globe of gas held together by its own gravity and supported by the internal pressure of its hot gases, which generate energy by nuclear fusion.
Light-Year (ly) Unit of distance equal to the distance light travels in one year.
Galaxy A large system of stars, star clusters, gas, dust, and nebulae orbiting a common centre of mass.
Milky Way The hazy band of light that circles our sky, produced by the glow of our galaxy.
Milky Way Galaxy The spiral galaxy containing our Sun, visible in the night sky as the Milky Way.
Spiral arms Long spiral pattern of bright stars, star clusters, gas and dust. Spiral arms extend from the centre to the edge of the disk of spiral galaxies.
Superclusters A cluster of galaxy clusters.
Created by: schris48
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