main sequence
true or false
the sun is not in the main sequence
false
what is a necessary for a Doppler effect
what is a different name for a big dipper
usra major
what is the color of the north star
white/yellow
what does the HR diagram do
shows relationship between stars temperature and luminosity
what is happening to the stars in the main sequence
fusing hydrogen into helium in there cores
what year was the Doppler effect proven
1872
what constellation never moves
north star/Polaris
what color is the hottest color in stars
blue
what do we learn from a stars HR diagram
how to classify stars based on temp and surface area
true or false
A stars lumonisty gradually increases in the main sequence
true
what does the Doppler effect prove
the increase or decrease in frequency of sound and light
how many constellations are there
88
what is the color spectrum in the stars
OBAFGKM
where are largest stars on HR diagram
the upper left
how long do stars usually last in the main sequence
20 million years
What does the Doppler effect predict?
weather by analyzing frequency shifts in radar waves
how many constellation depict animals
42
what color do most stars have
white
what is the hottest star on HR diagram
class O
whats the biggest star in the main sequence
rigel
what does the Doppler method tell us
planets mass and shape of its orbit
what is the rarest constellation to see
ophiuchus
what colors do the red giants have
have orange and a little bit of red
where is the sun in the HR diagram
around middle of main sequence