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Earth Science Ch 3
| Question | Answer |
|---|---|
| coordinates | Astronomical equivalent of latitude and longitude |
| Celestial equator | The plane of the earth’s equator projected into the sky |
| declination | A star’s angular distance north or south of the celestial equator, same as latitude |
| Right ascension | A star’s longitudinal position, measured in hours and minutes |
| Prime Hour circle | A line passing through the celestial poles and a point called the vernal equinox, from which right ascension is measured |
| Magnitude | The measure of the brightness of a star |
| Red Shift | The difference in the observed wavelengths of light from a celestial body compared to the wavelengths emitted at the source |
| Proper Motion | Star’s motion that is across the sky |
| Radial Motion | Star’s motion that is either directly toward or away from an observer |
| Supergiant | The largest and most luminous stars. |
| White Dwarf | A very dense, very bright star about the same mass as the sun but only about a hundredth of its diameter |
| Density | The amount of matter (mass) contained in a single volumetric unit of a substance |
| Eclipsing binaries | Two stars that revolve around each other so that one star crosses in front of another, causing a change in brightness |
| Cepheid Variable | A star that varies in brightness because it expands and contracts regularly |
| period | How long stars go from one bright spurt to the next |
| nova | A star that increases in brightness for a few months and then returns to its original brightness. |
| Supernova | A star that suddenly increases its apparent brightness by about twenty magnitudes because of an explosion that essentially destroys it |
| Neutron star | An extremely dense, small, dark star in which atomic particles (electrons and protons) have combined to form neutrons |
| Star clusters | A group of related stars that appear to have the same motion |
| galaxy | Contains millions of stars |
| nebulae | Clouds of gas/dust |
| Quasar | An unusually bright celestial object that produces strong radio emissions |
| spiral | Which type of galaxy is the Milky Way? |
| 88 | The number of modern constellations |
Created by:
jrasmussenheritage
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