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Astronomy 1

Unit 3 vocab

TermDefinition
Photosphere The lowest layer in the sun's atmosphere
Chromosphere The second lowest layer in the sun's atmosphere
Corona The outermost layer in the sun's atmosphere
Solar Wind A continuous stream of plasma from the sun
Sunspot Spots on the sun that are darker than other places
Prominence An eruption of clouds of glowing ionized gas
Solar Flare A sudden eruption of hydrogen from the chromosphere in the sun's atmosphere
Nuclear Fusion When many nuclei collide to form larger nuclei
Constellation A group of stars forming a pattern in the sky
Binary Star System of 2 stars orbiting a common center of mass
Light-Year The distance light travels in one year
Apparent Magnitude The measure of the amount of light from a star that is recieved on Earth
Absolute Magnitude The measure of the amount of light that a star actually gives off
Main-Sequence Star A star that lies on a diagonal bend
Red Giant A reddish star with a relatively low surface temperature
Supergiant A red giant that has swollen to many times its normal size; sometimes 2,000 times the size of our sun
Nova a white dwarf star that suddenly becomes very bright for a short time
Hertzsprung-Russell Diagram A graph in which the absolute magnitude of stars is plotted vertically against their surface temperatures
Protostar A celestial object of a contracting cloud of interstellar medium
Supernova An exploding star
White Dwarf The last stage in the life cycle of a star
Neutron Star The collapsed core of a supernova
Black Hole An extremely dangerous object in space that nothing can escape from, not even light, and is nearly impossible to see
Galaxy Countless stars grouped together
Big Bang Theory How the universe began
Created by: 3083436
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