Chapter 3 Stars, Galaxies, and the Universe
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| constellation | A pattern of stars in the sky.
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| visible light | Electromagnetic radiation that can be seen with the unaided eye.
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| Electromagnetic radiation | Enery that travels through space in the form of waves.
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| Wavelength | The distance between the crest of one wave and the crest of the next.
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| spectrum | The range of wavelengths of electromagnetic waves.
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| refracting telesccope | A telescope that uses convex lenses to gather and focus light.
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| convex lens | A piece of transparaent glass curved so that the middle is thicker than the edges
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| reflecting telescope | A telescope that uses one of more mirrors to gather light.
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| radio telescope | A device used to detect radio waves from objects in space.
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| observatory | A building that contains one or more telescopes.
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| spectrograph | An instrument that separates light into colors and photographs the resulting spectrum.
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| galaxy | A giant structure that contains hundreds of billions of stars.
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| universe | All of space and everything in it.
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| light-year | The distance that light travels in one year.
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| parallax | The apparent change in position of an object.
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| giant star | A very large star, much larger than the sun.
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| apparent magnitude | The brightness of a star as seen from Earth.
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| absolute magnitude | The brightness of a star if it were a standard.
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| Hertzsprung-Russell diagram | A graph relating the temperature and brightness of stars.
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| main sequence | An area on the Hertzsprung-Russell diagram that runs from the upper left to the lower right and includes more than 90 percent of all stars.
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| pulsar | A neutron star that produces radio waves.
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| nebula | A large amount of gas and dust in space, spread out in an immense volume.
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| protostar | A contracting cloud of gas and dust; the earliest stage of a star's life.
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| white dwarf | The remaining hot core of a sstar after its outer layers have expanded and drifted out into space.
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| supernova | The explosion of a dying giant or supergiant star.
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| neutron star | A tiny stary that remains after a supernova explosion.
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| black hole | The remains of an extremely massive star pulled into a small volume by the force of gravity.
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| quasar | A distant galaxy with a black hole at its center.
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| binary star | A star system that contains two stars.
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| eclipsing binary | A star system in which one star periodically blocks the light from another.
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| spiral galaxy | A galaxy whose arms curve outward in a pinwheel pattern.
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| elliptical galaxy | A galaxy shaped like a flattened ball, containing only old stars.
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| irregular galaxy | A galaxy that does not have a regular shape.
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| big bang | The inital explosion that resulted in the formation and expansion of the universe.
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Review the information in the table. When you are ready to quiz yourself you can hide individual columns or the entire table. Then you can click on the empty cells to reveal the answer. Try to recall what will be displayed before clicking the empty cell.
To hide a column, click on the column name.
To hide the entire table, click on the "Hide All" button.
You may also shuffle the rows of the table by clicking on the "Shuffle" button.
Or sort by any of the columns using the down arrow next to any column heading.
If you know all the data on any row, you can temporarily remove it by tapping the trash can to the right of the row.
To hide a column, click on the column name.
To hide the entire table, click on the "Hide All" button.
You may also shuffle the rows of the table by clicking on the "Shuffle" button.
Or sort by any of the columns using the down arrow next to any column heading.
If you know all the data on any row, you can temporarily remove it by tapping the trash can to the right of the row.
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Created by:
catrin013