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Chapter 27.1

Chapter 27.1 Notes

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
Created by: surfergurl