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8th grade chapter 24
Studying the Sun
22
Science
Not Applicable
07/28/2005

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Term
electromagnetic spectrum
Definition
a range of electromagnetic waves arranged in order of wavelength and frequency -

travel at the same speed ,300 million meters per second in a vacuum
Term
optical telescope
Definition
is an instrument that gathers and magnifies light from faraway places
Term
refracting telescope
Definition
telescope that uses CONVEX LENSES to bend or refract light to make an enlarged image
Term
reflecting telescope
Definition
uses a CONCAVE MIRROR to collect light
Term
radio telescopes
Definition
telescope that can receive RADIO WAVES from sources in space
Term
Hubble Space Telescope
Definition
ia an optical telescope located out past our atmosphere launched in 1990
Term
The Doppler Effect
Definition
refers to the perceived change in waelength of a wave that is emitted from a source that is moving away or toward an object
Term
spectroscopy
Definition
the study of the properties of light that depend on wavelengths
Term
photon
Definition
a tiny particle of light energy that exert radiation pressure
Term
continuous spectrum
Definition
made by an incandescent solid, liquid or gas under high pressure
Term
absorption spectrum
Definition
made when white light ispasses through a somewhat cool gas under low pressure
Term
emission sprectrum
Definition
a series of bright lines of particular wavelengths depending on the gas that produces them

made by a hot gas under low pressure
Term
Chromatic Aberration
Definition
a troublesome effect associated with refracting telescopes that weakens an image and produces a halo of color around it
Term
photosphere
Definition
the bright yellow "surface" of the sun's atmosphere - is the part we see from Earth
Term
Chromosphere
Definition
thin layer of hot incandescent gases a few thousand km thick under low pressure

the sun's atmosphere, between the photosphere and the Corona. - colored red by glowing hydrogen
Term
Corona
Definition
outermost and largest layer of the sun's atmosphere- charged particles escape the corona and move through space as the solar wind
Term
solar wind
Definition
streams of protons and electrons that boil from the corona
Term
sunspots
Definition
a cooler, dark spot on the photosphere - have a strong magnetic field - not a permanent feature on the sun
Term
solar prominence
Definition
huge, flame-like arches in corona made of chomospheric gases
Term
solar flares
Definition
outbursts of light and solar winds - that last an hour or so; appear as a sudden brightening of the region above a sunspot cluster
Term
aurora
Definition
high energy particles given off by the sun and captured by the Earth's magnetic field
Term
nuclear fusion
Definition
energy the sun makes deep within its interior
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