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Science 8

8.8A-B Components of the Universe

TermDefinition
Universe all space and the matter space contains
Star a self-luminous celestial body consisting of a mass of gas help together by its own gravity in which the energy is generated by nuclear reactions in its interior
Hertzsprung-Russell Diagram a plot of the surface temperature (color) or stars vs. their luminosity (brightness)
Luminosity the intensity if light from a celestial body that can be used to identify the body's characteristics
Main Sequence stable stars in the middle development phases that ploy along a continuous diagonal belt on the H-R Diagram
Nebula large cloud of gas and dust in interstellar space; the location of star formation
Supernova the death of a large star by explosion
Black Hole the remains of a star or other large object that collapsed under its owe gravity to form a super dense object with gravity so strong light cannot escape irs pull
Galaxy a large grouping of stars in space
Elliptical Galaxy a galaxy with a ling oval shape, a bright center, no apparent internal structure or spiral arms, and very little dust or gas
Spiral Galaxy a galaxy with a bulge in the center and very distinct long arms winding around the center
Lenticular Galaxy galaxy with a central bulge or bar with short arms, if any present
Irregular Galaxy a galaxy with very little symmetry that does not fit into any category
SUn the luminous star, composed mainly of hydrogen and helium, around which other planets and Earth revolve
Milky Way Galaxy the galaxy in which the Sun and Earth are located
Spiral Arms streaming arcs of millions of stars swirling around the center of a spiral galaxy such as the Milky Way
Galactic Center rotation center of a galaxy
Dust Lanes bands of dust that appear as darks ribbons against the bright star in a galaxy
Solar Mass used in astronomy as a standard unit to compare the size of other stars with our Sun
Speed of Light how fast light travels (i.e. 300,00 km/s)
Scale Model a representation of an object that is accurate in its proportions to the actual object