The Learn Tracker
...life-long learning: structured, organized, searchable...
924
Lectures Watched
Since January 1, 2014
Hundreds of free, self-paced university courses available:
my recommendations here
Peruse my collection of 275
influential people of the past.
View My Class Notes via:
Receive My Class Notes via E-Mail:

VIEW ARCHIVE

Contact Me via E-Mail:
edward [at] tanguay.info
Notes on video lecture:
Seven Stars and a Nebula
Notes taken by Edward Tanguay on January 6, 2016 (go to class or lectures)
Choose from these words to fill the blanks below:
hydrogen, Zeus, Apollo, nebula, east, ninth, Kunowsky, triple, exhausted, blue, million, 79, diffuse, hunter, Alnitak, white, shoulders, supergiant, luminous, feet, Mintaka, 24
•
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