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Science Vocabulary
| Term | Definition |
|---|---|
| Constellation | A group of stars that form a pattern |
| Gnomon | Upright pole that casts a shadow; length- time of year; place- time of day |
| Quadrant | Handheld instrument with movable index armthat indocates the angle of elevation between a star , sun or moon and the horizon |
| Refract | A wave that moves from one substance into another, changing the speed and direction of the wave |
| Objective lens | Light gathering |
| Ocular | Eye piece lens |
| Resolution | The ability of a telescope to bring out details in an image |
| Wave length | The horizontal distance between a wave’s crest to the next wave crest |
| Compound lens | Special lenses consisting of two different kinds of glass cemented together |
| Chromatic aberration | Occurs when various colors of light are refracted differently |
| Coordinate | Celestial coordinate are declination, given in degrees north or south of the Celestial equator, and right ascension, given in hours, minutes, and seconds east of the prime hour circle |
| Celestial equator | The projection of the earth equator on to the celestial sphere; position 0° declination |
| Prime- hour circle | The reference line for Celestial longitude, extending from the north to the south Celestial poles through the point of the vernal equinox. Position of zero hours of the right ascension |
| Hubble space telescope | An astronomical reflecting telescope placed in earths orbit by the space shuttle in 1990. The HST has provided amazing images of the universe that have change the course of astronomy |
| Magnitude | Star’s brightness |
| Red shift | For stars more distant than 325 light years away astronomers use a mathematical tool that relates the stretching of wavelengths of their light with increasing distance |
| Proper Motion | A stars movement across the sky as we see it |
| Radial motion | movement directly toward or away from us |
| Temperature | How hot or cold something is |
| Super giant | The largest and brightest star in a constellation |
| White dwarves | Very hot, blue white stars that are relatively small but very dense |
| Density | The amount of matter or mass contained in a single volume metric unit of substance or how much something has inside of it |
| Eclipsing binaries | Two stars orbiting each other around a mass or revolving around each other |
| Cepheid variable | A type of star that changes in brightness regularly |
| Nova | A star that explodes and increases in brightness but isn’t destroyed and may explode again later |
| Super nova | A star that suddenly increases an apparent brightness by about 20 magnitude because of an explosion that essentially destroys it |
| Neutron star | When is super nova explode, it is talk to leave behind a cloud of dust and a neutron star. This is an extremely dense, small, dark star⭐️ |
| Galaxy | Consists of millions of stars that are arranged in a variety of patterns around a gravitational center |
| Nebula | A cloud of gas and dust in outer space |
| Black hole | Hey small object or region in space with gravity so intense that it is believed that matter, energy, and even light cannot escape from within its boundaries |
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GuineaPigwca
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