exam 3, homework study Flashcards
which star has the lowest surface temp? (coolest)
M
the main reason the spectra of stars do not all look alike is because they….
have different temps
the element that makes up the largest part of the star is… (75% by mass)
hydrogen
star order coolest to hottest
red, orange, yellow, blue white, blue
the sun is made up of entirely hot gas (T/F)
True
if you looked up at the sun, you see the….
photosphere
absorption line spectrum are used to tell us the outer layers of the sun (T/F)
true
hottest zone in the sun
core
suns most common element
hydrogen
hotter region directly above the suns visible surface
chromosphere
as you go upwards from the suns photosphere, the density decreases (T/F)
True
the part of the suns atmosphere with the lowest density
corona
solar wind can be captured by the earths magnetosphere. When particles spiral down alone the magnetic field into the atmosphere they’re responsible for …
aurorae (Nothern & Southern lights)
The sun rotates at different rates at different latitudes on the sun (T/F)
True
sunspots are darker than the regions around them because they’re cooler than the material around them (T/F)
True
the number of sunspots get larger and smaller over the course of 11 years (T/F)
True
What is Luminosity?
how much energy a star gives off per second
is 2 stars have the same luminosity but Star Y is 4 times dimmer looking then Star X. That means…
Star Y is twice as far as Star X
what color star is likely to be the hottest?
Blue-Violet
A star with an apparent magnitude of ____ looks the brightest in the sky
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