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26 terms

Earth Sci Astronomy Unit Pt 2

STUDY
PLAY
Fusion
The creation of energy by joining the nuclei of two hydrogen atoms to form helium.
Luminosity
How bright a star will be in relation to the sun
Magnitude
Another word for brightness
Photosphere
The lowest layer of the Sun's atmosphere and the layer that gives off light
Chromosphere
A thin layer of the sun's atmosphere between the corona and the photosphere; too faint to see unless there is a total solar eclipse
Corona
The outer layer of the sun's atmosphere; looks like a crown around it during a solar eclipse
Sunspot
A dark area of gas on the sun that is cooler than surrounding gases
H-R Diagram
Hertzsprung-Russell diagram, a graph that shows the relationship between a star's surface temperature and absolute magnitude
Nebula
A large cloud of gas and dust in interstellar space; a region in space where stars are born
Black Hole
Remnant of a star that is so dense that nothing, not even light, can escape its gravity field.
Supernova
The brilliant explosion of a dying supergiant star
Neutron Star
The collapsed core of a supernova whose dense core has only neutrons
White Dwarf
The blue-white hot core of a star that is left behind after its outer layers have expanded and drifted out into space
Supergiant Star
The largest star yet has the shortest lifespan; about 1000 times the diameter of sun
Giant Star
A large star with great luminosity and a diameter 10 to 100 times greater than that of the sun
Constellation
A group of stars that form a pattern in the sky
Asterism
Small groups of stars that form a pattern within constellations
Circumpolar
A term describing a star that neither rises nor sets but appears to rotate around one of the celestial poles.
Core
The central region of a star, where nuclear fusion takes place
Solar Flares
Violent eruptions of particles and radiation from the surface of the Sun
Prominence
A loop of gas that protrudes from the sun's surface, linking parts of sunspot regions
Solar Wind
A stream of electrically charged particles that come from the sun's corona
Protostar
Early form of a star; This stage lies between the collapsing of dust and gas and the beginning of nuclear fusion
Main Sequence
A band of stars that includes most stars of average color, size, magnitude, and temperature
Convective Zone
The region of the sun's interior that is between the radiative zone and the photosphere and in which energy is carried upward by convection
Radiative Zone
The middle zone of the sun's interior where thermal energy moves outward from the core by radiation