Shared Flashcard Set

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stars galaxies and the Universe
N
18
Science
7th Grade
02/01/2012

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Cards

Term
what is visable light
Definition
light that were can see
Term
what is a wavelength
Definition
it is the distance between a wave to another
Term
Electromagnetic radiation
Definition
energy that travels threw waves
Term
what is the spectrum
Definition
it is the colors of visable light like red blue yellow orange green purple
Term
what is a telescope
Definition
it is an object that makes distance objects appear closer
Term
what is an optical telescope
Definition
it is tele that uses mirrors to collect and focus viable light
Term
what is a refracting telescope
Definition
a tele that uses convex lenses to gather and focous light
Term
what is a convex lenses
Definition
it is curved piece of glass so the middle is thicker than thew outside
Term
reflecting telescope
Definition
it is a telescope that uses a curved mirror to collect focus light
Term
what is a radio telescope
Definition
thay capture radio waves
Term
what is an observatory
Definition
building that contains one or more telescopes
Term
what is a constellation
Definition
it is a grope of stars that look like a picture
Term
what is used to classify stars
Definition
color,temperature,size,composition,
brightness
Term
what is the hottest type of star
Definition
blue=hottest red=coldest
Term
wwhat is a spectrograph
Definition
it is a graph that breaks light into colors
Term
what is apperent brioghtness
Definition
the brightness seen form earth
Term
what is absolute brightness
Definition
the brightness a star would have if it were at a standered distance form the earth
Term
what is a light-year
Definition
it is a distance light travels in one year around 9.5 billion Kilometers
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