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35 Cards in this Set
- Front
- Back
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What is energy radiated in the form of a wave, resulting from the motion of electric charges and the magnetic fields they produce.
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electro-radiation
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What do you call a star that is at the point in its life cycle in which it is actively fusing hydrogen nuclei into helium nuclei; also the band of the HR diagram depicting such stars.
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main-sequence
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The superdense remains of a massive star that collapsed with enough force to push all of its electrons into the nuclei they orbit, resulting in a mass of neutrons.
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neutron star
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The average distance between Earth and the sun.
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astronomical unit
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A distant neutron star that emits rapid pulses of light and radio waves instead of steady radiation.
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pulsar
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A large star with great luminosity and a diameter 10 to 100 times greater than that of the sun.
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giant star
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Groups of millions, or even billions, of stars held together by gravity.
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galaxies
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The measure of how bright a star appears to be to an observer on Earth.
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apparent magnitude
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The remnant of a giant star that has lost its outer atmosphere; the glowing stellar core.
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white dwarf
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The most luminous, most massive stars, with diameters greater than 100 times the diameter of the sun.
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super giants
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A large cloud of gas and dust in space.
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nebula
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The measure of how bright a star would be if it were located 10 parsecs from Earth.
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absolute magnitude
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A continuum depicting the range of electromagnetic radiation, with the longest wavelength at one end and the shortest at the other.
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electrospectrum
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The brilliant burst of light that follows the collapse of the iron core of a massive star.
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supernova
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A spectrum that contains all colors or wavelengths.
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continuous spectrum
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The measure of how bright a star appears to be to an observer on Earth.
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apparent magnitude
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The distance that light travels in one year, about 9.5 trillion kilometers.
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light year
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The remnant of a giant star that has lost its outer atmosphere; the glowing stellar core.
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white dwarf
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The theory holding that the universe originated from the instant expansion of an extremely small agglomeration of matter of extremely high density and temperature.
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big bang model
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The most luminous, most massive stars, with diameters greater than 100 times the diameter of the sun.
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super giants
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A large cloud of gas and dust in space.
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nebula
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The measure of how bright a star would be if it were located 10 parsecs from Earth.
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absolute magnitude
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A continuum depicting the range of electromagnetic radiation, with the longest wavelength at one end and the shortest at the other.
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electrospectrum
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The brilliant burst of light that follows the collapse of the iron core of a massive star.
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supernova
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A spectrum that contains all colors or wavelengths.
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continuous spectrum
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The distance that light travels in one year, about 9.5 trillion kilometers.
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light year
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The theory holding that the universe originated from the instant expansion of an extremely small agglomeration of matter of extremely high density and temperature.
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big bang model
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A variable star that brightens and dims regularly, or pulses, and whose distance can be determined from its period of pulsation.
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Cepheid variables
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A group of stars that appear to form a pattern in the sky.
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constellation
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A unit of measurement used to describe distances between celestial objects, equal to 3.258 light-years.
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par sec
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A very distant, extremely luminous celestial object that scientists consider to be a type of active galactic nuclei.
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quasar
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A continuous spectrum crossed by dark lines produced when light passes through a nonincandescent gas.
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absorption spectrum
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The brightness of a star.
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luminosity
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The final life stage of an extremely massive star, with a gravitational field so intense that not even light can escape.
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black hole
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A halo of gases that is formed by the expelled layers of star’s atmosphere.
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planetary nebula
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