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BellaireSCI8AstroCH3
BellaireSCI8 Astronomy CH3
| Question | Answer |
|---|---|
| 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
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