Help
Options
Didn't know it?
click below
click below
Knew it?
click below
click below
Don't Know
Remaining cards (0)
Know
retry
shuffle
restart
0:00
Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.
Normal Size Small Size show me how
Normal Size Small Size show me how
star unit
| Question | Answer |
|---|---|
| constellations | group of stars that form a pattern in the sky. 88 constellations |
| circumpolar constellations | constellations seen all year. |
| seasonal | most constellations are only seen during certain seasons because of earths changing position in its orbit around the sun |
| star cluster | a group of stars that are gravitationally bound to each other |
| open cluster | stars are not densely packed . found in the disk or center of galaxies. |
| globular cluster | the group of stars are densely packed into a spherical shape. found in the halo of galaxies, contain more stars and are much older than open cluster stars. |
| binary star | two stars that are bound together by gravity and orbit around a common center of mass. |
| eclipsing binary | |
| parallax | the apparent shift in position of stars or other objects caused by the change in position of the observer. the closer the star the longer the shift |
| light year | |
| parsec | |
| magnitude | how bright a star appears -40 brightest to +40 dimmest) |
| apparent magnitude | how bright a star appears to be by the observer. lower the number the brighter it is. |
| absolute magnitude | refers to the true brightness of a star. lower the number, brighter it is. |
| luminosity | the energy output from the surface of a star per second |
| spectra type classification | used to identify composition of stars - identify planets atmosphere- and how hot or cool a star is . |
| bright-line/ emission spectra | unevenly spaced series of lines of different colors and brightness. black background |
| dark line/ absorption spectra | continuous spectrum with dark lines where light is absorbed by different chemical. |
| continuous spectrum | the source is sending out light from all visible wave lengths producing an unbroken band of colors. |
| spectroscope | instrument that uses an prism or diffraction grating to separate light and study starlight. |
| Doppler effect | change in frequency of light or sound when the course of the waves is moving relative to observer. |
| red shift | distance from earth in increasing; wavelengths star emits longer; star is moving away. |
| blue shift | distance from earth decreasing star moving towards earth. |
| no shift | distance not changing |
| HR diagram | |
| protostar | |
| main sequence | group of stars in stable state. form a diagonal line on the hr diagram |
| black dwarf | |
| brown dwarf | |
| white dwarf | small, old star |
| super nova | massive exploding star |
| red giant | large, cool star |
| pulsar | neutron star that sends out radio waves |
| neutron star | |
| black hole | an object in space whose gravity is so strong light cannot escape it |
| nuclear fusion | combining of lightweight nuclei into heavier nuclei. |
| nebula | cloud of dust and gas in space where stars are born |
| life cycle of average star | |
| life cycle of massive star | |
| star composition | |
| star temperature (colors) | m- coolest |
| galaxies | enormous collection of a few billion to trillions of stars, gas, and dust held together by gravity. |
| spiral galaxy | consists of a flat, rotating disk containing pinwheel arms, bulge at center and a halo. |
| elliptical | smooth,ball shaped appearance. round to oval in shape. do not have disks or arms |
| irregular | tend to be smaller objects without a definite shape. |
| quasar | star like, very bright, extremely distant objects with emission lines in their spectra. |
| halo | |
| nuclear bulge | |
| disk | |
| steady state theory | |
| big bang |
Created by:
dk7
Popular Earth Science sets