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Chapter 27.1
Chapter 27.1 Notes
| Question | Answer |
|---|---|
| Life on earth is dependent on the - | sun |
| Stars vary in - | color |
| - is a red star | Betelguese |
| - is a blue star | Rigel |
| - is a yellow star | Sun |
| Stars vary in - and - as well as color | size; color |
| Most stars are the same size as the - | sun |
| Every chemical element has a characteristic- | spectrum |
| Colors and lines ina spectrum indicate- | which elements make up a star |
| In most stars- is the most common element | hydrogen |
| - is the second most common element in stars | Helium |
| Surface temperature is indicated by - | color |
| - stars are the hottest | blue |
| - stars are the coolest | red |
| - stars have moderate temperatures | yellow |
| The sun has a surface temperature of- | 5500C |
| The core temperature of the sun is | 15 million C |
| - motion can only be seen through a high powered telescope | actual |
| - motion can be seen without a telescope | apparent |
| Another name for the North Star is the - | Polaris |
| The North Star is located over the - and does not appear to move | North Pole |
| Stars that are always visible in the night sky lie close to the - | Polaris |
| Stars that are always visible are called - | circum- polar |
| The speed of light is- | 300,000 km/s |
| Light travels - in one year | 9.5 trillion km |
| The sun reaches the earth in - | 8 minutes |
| Earth's closest star system is- | Alpha Centauri |
| - is the brightest star seen from Earth | Proxima Centauri |
| Scientists can calculate the distance of a star by using two measurments: -- | true brightness and apparent brightness |
| Over - stars can be seen thru a telescope | 3 billion |
| Only about - stars are visible | 5000 |
| - magnitude is the brightness of a star as it appears from Earth | apparent |
| The - shows a pattern of the brightness of stars increases with surface temperatures | H-R diagram |
| The H-R diagram shows ----- | relationship between surface temperature, size, and the brightness of a star |
| The band of colors extends from - - stars to -- stars | cool, dim ; hot ,bright |
| The sun and almost every star in the sky is - star | main sequence |
| Cool stars are bright if their surface is - | large |
| Hot stars are dim in the night sky because they are - | small |
| The sun is a - sized star and a - temperature star | medium |
| - and - mean star | stellar; astro |
| The visibility of a star depends on - and - | brightness; distance |
| - is the true brightness of a star | Absolute magnitude |
| The brightness of most stars - as the temperature increases | temperature |
| - are hot stars but only the size of earth | white dwarfs |
| body of gases that give off light and heat | star |
| separates light into different forms of wavelengths | spectroscope |
| display of colors and lines | spectrum |
| apparent shift in the wavelength of light | Dopppler Effect |
| spectrum of a star moving toward the Earth is toward the blue end | blue shift |
| brightens and fades in a regular pattern | Cephied variable star |
| huge stars | red giants |
| really huge stars | super giants |
| method to determine the distance between stars and the Earth | parallax |
| distance between the stars and the Earth | light years |
| a star moving away from the earth | red shift |
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surfergurl
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