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Notes on video lecture:
Seven Stars and a Nebula
Choose from these words to fill the blanks below:
ninth, Apollo, blue, feet, nebula, 24, Mintaka, diffuse, white, shoulders, exhausted, Alnitak, luminous, million, east, hydrogen, supergiant, triple, 79, hunter, Zeus, Kunowsky
Orion
in south          part of sky
three stars in a line
his belt
two stars below are his         
two stars above are his                   
Orion             
a                nebula situated in the Milky Way
visible to the naked eye
the closest region of massive star formation to Earth
     light years across
regions of red and of blue-violet
Greek mythology
Orion was a             
he first appears as a great hunter in Homer's epic the Odyssey, where Odysseus sees his shade in the underworld
Artemis was tricked by her brother              and killed her friend Orion
she asked          to put him up in the stars
Orion's stars
shoulders
Betelgeuse
red                     
second-brightest in the constellation of Orion
          -brightest star in the sky
Bellatrix
third brightest star in the constellation Orion
27th brightest star
a massive star with about 8.4 times the Sun's mass.
20 million years
old enough for a star of this mass to consume the                  at its core and begin to evolve away from the main sequence into a giant star
stars live different lengths of time, depending on how big they are
a star like our sun lives for about 10 billion years, while a star which weighs 20 times as much lives only 10                years
belt
              
multiple star
primary star is a hot          supergiant
reported to be a double star by amateur German astronomer George K.                  in 1819
Alnilam
a large blue supergiant star some 1,340 light years distant
275,000 to 537,000 times as                  as the Sun, and around 34 times as massive
the middle star
              
1,200 light years distant
one of the brightest stars in the sky
feet
Saiph
star at the south-eastern corner
a bright supergiant star that has                    the supply of hydrogen at its core
Rigel
the brightest star in the constellation Orion
the seventh brightest star in the night sky
actually a              star system
Rigel A: a blue-           supergiant
it has exhausted its core hydrogen and swollen out to      times the Sun's radius
Rigel B: a spectroscopic binary system, consisting of two main sequence blue-white stars of spectral type B9V that are themselves estimated to be 2.5 and 1.9 times as massive as the Sun
Seven Stars and a Nebula