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20 Cards in this Set
- Front
- Back
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an ordered array of the components of an emission or wave
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Spectrum
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-a shift in the spectra of very distant galaxies toward longer wavelengths (toward the red end of the spectrum)
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Red Shift
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-change in the apparent frequency of a wave as observer and source move toward or away from each other
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Doppler Effect
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-the theory that the universe originated sometime between 10 billion and 20 billion years ago from the cataclysmic explosion of a small volume of matter at extremely high density and temperature
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Big Bang Theory
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-a starlike object that may send out radio waves and other forms of energy; many have large red shifts
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Quasar
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-the apparent displacement of an object as seen from two different points that are not on a line with the object
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Parallax
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-a nuclear reaction in which nuclei combine to form more massive nuclei with the simultaneous release of energy
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Nuclear Fusion
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-a degenerate neutron star; small and extremely dense; rotates very fast and emits regular pulses of polarized radiation
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Pulsar
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- is a scatter graph of stars showing the relationship between the stars' absolute magnitudes or luminosity versus their spectral types or classifications and effective temperatures.
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Hertzsprung-Russell Diagram
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- a star that explodes and becomes extremely luminous in the process
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Supernova
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- a region of space resulting from the collapse of a star; extremely high gravitational field
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Black hole
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- A normal star like the Sun that is burning hydrogen in nuclear reactions to produce its energy
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Main Sequence star
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- a star that has collapsed under its own gravity; it is composed of neutrons
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Neutron Star
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- a faint star of enormous density
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White dwarf
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- (m) of a celestial body is a measure of its brightness as seen by an observer on Earth, normalized to the value it would have in the absence of the atmosphere. The brighter the object appears, the lower the value of its magnitude.
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Apparent magnitude
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- the magnitude that a star would have if it were viewed from a distance of 10 parsecs (32.62 light years) from the earth
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Absolute Magnitude
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- an immense cloud of gas (mainly hydrogen) and dust in interstellar space
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Nebula
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- a collection of star systems; any of the billions of systems each having many stars and nebulae and dust; "`extragalactic nebula' is a former name for this.
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Galaxy
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- the (usually elliptical) path described by one celestial body in its revolution about another
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Orbit
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- rotation: a single complete turn (axial or orbital)
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Revolution
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