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Ch. 12, L1: Starlight

Pages 140-143
by

Serena King

on 2 December 2014

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Transcript of Ch. 12, L1: Starlight

actual brightness depends on the size and temp.
-> size - the larger the star the more matter there is to burn

-> temp. - measured on Kelvin Scale; reveals how much light it gives off
color depends on temp.
hotter = blue or white
cooler = yellow, orange or red
Apparent Magnitude:
based on perspective from earth
-> doesn't provide an accurate intensity of the star
EX: sun appears as the brightest star to earth bcse it is closest to earth
shown with numbers
-> brighter it appears, lower the number
-> fainter it appears, higher the number
objects w/ negative numbers are brighter than objects with positive numbers
sun's apparent magnitude is -26.7 bcse it is so close to earth

actual brightness affects apparent magnitude

starlight is the visible product of energy released by fusion

is affected by distance from earth, temp. and size
Absolute Magnitude:
how bright star is compared to all other stars if put at standard distance from earth (32.6 light yrs)

light year is the distance light travels in one year inside an area w/ no matter (5.88 trillion miles)

has an effect on how bright a star appears from earth

dependent on size and temp.
Light of Planets and Moons:
don't produce their own light like stars

reflect light of stars

absolute and apparent magnitude used to describe their brightness

measured when visible side is fully illuminated like a full moon
Brightness of Stars:
stars are always burning (even during daytime)

seem brighter and more numerous in secluded places because other lights aren't overpowering them


Starlight pages 140-143
absolute magnitude = actual brightness of a celestial object
apparent magnitude = the measure of a celestial body's brightness as observed from earth
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