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astronomy 2

TermDefinition
Photosphere Star's outer shell where light is radiated.
Chromosphere Sphere of color. Second of 3 main layers in Sun's atmosphere.
Corona Circles of light seen around Sun or Moon.
Solar Wind Flow of charged particles (mainly protons and electrons) that interacts with the magetic feild of Earth.
Sunspot Dark patch that appears periodically on the surface of the Sun.
Prominence Eruption of cool high-density gas from solar chromosphere into corona.
Solar Flare Powerful explosion from Sun's surface.
Nuclear Fusion Two or more nuclei come very close and collide at high speed.
Constellation Groups of stars.
Binary Star System of two stars that revolve around a common mass.
Light-year The distance light travels in one solar year. 5.88 trillion miles (9.46 trillion km) A unit in measuring stellar distances.
Apparent Magnitude The magnitude of a star as it appears on Earth.
Absolute Magnitude The magnitude of a star as it would appear to a hypothetical observer.
Main-sequence star Any star lying on a diagonal band.
Red Giant Star in intermediate stage of evolution. Large volume, low surface temp, reddish hue.
Supergiant Luminous star with a diameter that is more than 100 times that of the Sun.
Nova Star that suddenly becomes thousands of times brighter then gradually fades to original intensity.
Hertzsprung-Russell Diagram Graph showing absolute magnitude plotted against surface temp for a group of stars.
Protostar Early stage in evolution of a star.
Supernova Explosion of a star, possibly caused by gravitational collapse.
White Dwarf Star approximately the size of Earth. Has undergone gravitational collapse, is in the final stage of evolution for low-mass stars.
Neutron Star Extremely dense, compact star primarily made of neutrons.
Black Hole Formed at the beginning of the universe or by the gravitational collapse of a star exploding. Gravitational field so intense, no electromagnetic radiation can escape.
Galaxy Large system of stars held together by mutal gravitation and isolated from similar systems my large regions of space.
Big Bang Theory Scientific Theory of the Universe orgininating in an explosion of extrememly high density and temperature.
Created by: tyler.lane
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