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BellaireSCI8 Astronomy CH3

Constellation patterns of stars in the sky
Visible light the light you see with your eyes
Electromagnetism radiation energy that can travel directly through space in the form of waves
Wavelength the distance between the crest of one wave and the crest of the next wave
Spectrum made up of the colors red, orange, yellow, green, blue, and violet
Different waves the electromagnetic spectrum includes are… infrared radiation, visible light, ultraviolet radiation, X-rays and gamma rays
Refracting telescope uses convex lenses to gather a large amount of light and focus it onto a small area
Convex lens a piece of transparent glass, curved so that the middle is thicker than the edges
Reflecting telescope Isaac Newton, a telescope that uses one or more mirrors to gather light; the mirror focuses a large amount of light onto a small area
Radio telescopes a device used to detect radio waves from objects in space; they have curved reflecting surfaces
Observatory a building that contains one or more telescopes most located on top of mountains or large hills
Spectrograph breaks the light from an object into colors and photographs the resulting spectrum
Galaxy the Milky Way is our galaxy, a giant flat surface that contains hundreds of billions of stars
Universe billions of galaxies, astronomers define it as all space and everything in it
Light-year is the distance that light travels in one year or about 9.5 million million kilometer
Medium sized star our sun
Giant star very large stars , much larger than the sun
Apparent magnitude is a star’s brightness as seen from Earth, it can be measured fairly easily using electronic devices
Absolute magnitude the brightness the star would have if it were at a standard distance from Earth, much more complicated to find a star’s absolute magnitude
Hertzsprung-Russel diagram H-R diagram shows the relationship between surface temperature and brightness
Main sequence a diagonal line in the H_R diagram that shows the sequence of surface temperature increase and brightness increases; 90% of the stars are main sequence stars
Pulsars a neutron star that produces radio waves
Nebula a large amount of gas and dust in space, spread out in an immense volume
Protostar in Greek Proto means “earliest”; is the earliest stage of a star’s life
White draft the remaining hot core of a star after its outer layers have expanded and drifted out into space
Supernova the explosion of a dying giant or supergiant star
Neutron stars a tiny star that remain after a supernova explosion
Black Holes the initial explosion that resulted in the formation and expansion of the universe
Quasars a distant galaxy with black hole at its center
Binary stars a star system that contains two stars
Eclipsing binary a star system in which one star periodically blocks the light from another
Spiral galaxy a galaxy that has the shape of twin spirals
Elliptical galaxies galaxies that look like flattened balls; these galaxies contain billion of stars but have little gas and dust between the stars
Irregular galaxies galaxies that do not have regular shapes; the Large Magellanic Cloud is an irregular galaxy
Big Bang the initial explosion that resulted in the formation and expansion of the universe
Created by: kdewey