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Astronomy (entire)
all of the astronomy text
| Question | Answer |
|---|---|
| astronomy | the study of universe |
| astr- | star, heavens, outerspace |
| light-year | the distance that light travels in one year; about 9.46 trillion kilometers |
| spectrum | the band of colors produced when light passes through a prism |
| apparent magnitude | the brightness of a star as seen from the Earth |
| absolute magnitude | the brightness that a star would have at a distance of 32.6 light-years from Earth |
| ab- | from, away |
| parallax | an apparent shift in the position of an object when viewed from different locations |
| Red Giant | a large, reddish star late in its life cycle |
| White Dwarf | a small, hot, dim star this is the left-over center of an old star |
| H-R Diagram | Hertzsprung-Russell diagram, a graph that shows the relationship between a star’s surface temperature and absolute magnitude |
| Supernova | a gigantic explosion in which a missive start collapses and throws its outer layers into space |
| super- | greater than normal, excessive |
| Black Hole | an object so massive and dense that even light cannot escape its gravity |
| Galaxy | a collection of stars, dust, and gas bound together by gravity |
| Nebula | a large cloud of gas and dust in interstellar space; a region in space where stars are born or where stars explode at the end of the lives |
| Cosmology | the study of the origin, properties, processes, and evolution of the universe |
| Rotation | the spin of a body in its axis |
| Orbit | the path that a body follows as it travels around another body in space |
| Revolution | the motion of a body that travels around another body in pace; one complete trip along an orbit |
| Phase | the change in the sunlit area of one celestial body as seen from another celestial body |
| Eclipse | an event in which the shadow of one celestial body falls on another |
| Comet | a small body of ice, rock, and cosmic dust that follows an elliptical orbit around the sun and that gives off gas and dust in the forms of a tail as it passes close to the sun |
| Asteroid | a small, rocky object that orbits the sun, usually in a band between the orbits of Mars and Jupiter |
| Asteroid Belt | the region of the solar system that is between the orbits of Mars and Jupiter and in which most asteroids orbit |
| Meteoroid | a relatively small, rocky body that travels through space |
| Meteorite | a meteoroid that reaches the Earth’s surface without burning up completely |
| Meteor | a bright streak of light that results when a meteoroid burns in the Earth’s atmosphere |
Created by:
RABBARNETT
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