| A | B |
|---|
| constellations | Imagined pattern in a group of stars |
| refractor telescope | A telescope that uses a lens to bring the light from an object to a focal point, magnifying light with eyepiece. |
| resolution | Ability to see detail in an image |
| composite telescope | Telescope that uses both mirrors and objective lenses for gathering light to a focal point |
| radio telescopes | Radio receiver with an extensive antenna that focuses, amplifies, and analyzes radio waves from space |
| latitude | Distance north or south of the equator measured in degrees |
| longitude | Distance east or wast of Greenwich, England, measured in degrees |
| celestial equator | Projection of earth's equator on celestial sphere |
| light year | Distance light travels in one year; 9.6 trillion km |
| nova | Star which explodes and increases up to ten magnitudes in brightness; may return to normal or explode again |
| supernova | Star that may increase its brightness by twenty magnitudes in an explosion that practically destroys the star |
| galaxy | Groups of millions of stars, usually elliptically arranged |
| nebulae | Clouds of gas and dust in space |
