Shared Flashcard Set

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Ch 15 science
na
11
Science
8th Grade
05/22/2009

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Cards

Term
Spectrum
Definition
the band of colors produced when white light passes through a prism
Term
Apparent magnitude
Definition
the brightness that a star as seen from earth
Term
absolute
Definition
the brightness that a star would have at a distance of 32.6 light yrs from earth
Term
light yr
Definition
the distance that light travels in one light travels in one year about 9.46 trillion km
Term
parallex
Definition
an apparent shift in the position of an object when viewed from different locations
Term
main sequence
Definition
the locations on the h-r diagram where most stars lie it has a diagonal pattern from the lower right to the upper left
Term
H-R diagram
Definition
hertzsprung russell diagram a graph that shows the relationship between a star's surface temp. & absolute magnitude
Term
supernova
Definition
gigantic explotion in which a massive star collapses and throws its outer layer into space
Term
galaxy
Definition
a collection of stars , dusts, and gas boung together by gravity
Term
nebula
Definition
a large cloud of gas and dust in interstellar space  region in space where stars are born
Term
big bang theory
Definition
the theory that all matter and energy in the universe was compressed in to an extremely small volume that  13 billion to 15 billion yrs ago exploded and began expanding in all directions
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