24 terms

Chapter 29 - Stars

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Terms in this set (...)

Photosphere
The visible surface of the sun
Chromosphere
The layer of the sun's atmosphere between the corona and the photosphere; only visible if there is a solar eclipse
Corona
The outermost layer of the sun's atmosphere
Solar Wind
A stream of gas flowing at high speeds from the Corona
Sunspots
Dark spots on the surface of the photosphere
Solar Flares
Violent eruptions of particles and radiation from the surface of the Sun
Prominence
An arc of gas that is ejected from the chromosphere, or is gas that condenses in the inner corona and rains back to the surface
Fusion
The combination of lightweight, atomic nuclei into heavier nuclei
Fission
The splitting of heavy atomic nuclei into smaller, lighter nuclei
Constellations
Brightest stars that many early civilizations named after animals, mythological characters, or everyday objects
Binary Stars
When only two stars are gravitationally bound together and orbit a common center of mass
Parsec
A measurement eqaul to 3.26 ly, or 3.086 x 10 to the 13th power km
Parallax
The shift of stars position cause by the motion of the observer
Apparent Magnitude
How bright a star appears
Absolute Magnitude
How bright a star would appear if it were placed at a distance of 10 pc
Luminosity
A stars power
Hertzsprung-Russell Diagram
Shows the relationship between the absolute magnitude and temperature of stars; is used to calculate the evolution
Main Sequence
The region most occupied by stars
Nebula
The cloud of interstellar gas and dust; how the formation of a star begins
Protostar
A disk shape with a hot, condensed object at the center; becomes a star
Neutron Star
A neutron's resistance to being squeezed close together creates a pressure that halts the collapse of the core, turning into a collapsed star remnant
Pulsar
The pulsating pattern of light shown from some neutron stars
Supernova
The explosion of the enture outer portion of the star
Black Hole
A small extremely dense object; gravity is so immense that not even light can escape it