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Sept 2. Opening Activity. As a star runs out of nuclear energy, what do you think will occur to the size of the star? Provide an explanation as to why you think that. Quizzes graded… will get back to you after 5 th period takes it (tomorrow). Today’s Date Opening Activity Work.

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opening activity

Sept 2

Opening Activity
  • As a star runs out of nuclear energy, what do you think will occur to the size of the star? Provide an explanation as to why you think that.

Quizzes graded… will get back to you after 5th period takes it (tomorrow)


Today’s Date

Opening Activity Work

Today’s Note(s)



Today’s Picture(s)

3 Types


Your Own Model

Main Sequence

Death of LM

Death of MM


Death of HM


Star Forces?

Exit Slip

star cycle
Star Cycle
  • There are 6 primary steps in the life and death of stars.
nebula cloud
Nebula Cloud
  • The nursery of stars. This “cloud” is a combination of Hydrogen, gas, and dust (remnants of other stars and objects of the universe).
  • The matter used to make stars are recycled from other substances in the universe.


The beginning of a star. The nebula cloud condenses due to gravity and forms a solid body.

The condensing of matter releases energy, the protostar is the first stage in which light is emitted.



Depending on the amount of matter in the nebula cloud, stars will either become low, medium or high mass stars.

ALL of the stars create Helium from fusing together two Hydrogen nuclei.

Low Mass Stars

Makes Helium only

High Mass Stars

Makes Helium - Iron

Med Mass Stars

Makes Helium - Carbon

death of low mass stars
Death of Low Mass Stars
  • When running out of fuel, low mass stars will simply collapse and die out.
medium mass stars
Medium Mass Stars
  • The main life of a medium mass stars is known as “main sequence stars”
  • There are different types of main sequence stars depending on the size/mass/ temperature/ luminescence/ etc.
  • Our sun is a “G” main sequence star (all other stars in the universe are compared to our sun).
medium mass stars turn into red giants high mass stars turn into super red giants
Medium mass stars turn into Red GiantsHigh mass stars turn into Super Red Giants
  • When running out of fuel, medium and high mass stars will expand into red giants and super red giants.

Med Mass

High Mass

Super Red Giants

Fuses to make Iron

Red Giants

Fuses to make Carbon

death of medium mass stars
Death of Medium Mass Stars
  • When fuel is completely gone, the medium mass stars will shrink on their own gravity.
  • Red giants will turn into dwarf stars depending on the amount of energy left (red dwarf, white dwarf, brown dwarf, etc.)

Red Giant

Dwarf Stars

death of high mass stars supernovas
Death of High Mass StarsSupernovas
  • Depending on the amount of mass/energy, the stars can explode.
  • High Mass stars often times explode!
  • This spreads all of the elements Hydrogen through Iron (which makes up our planets and other new stars) and forms all elements after Iron (up to element 92).

Super Red Giants


Forms elements Iron-Uranium

  • Blackholes are the result of dwarf stars that collapse on themselves.
  • The stars have run out of fuel (so no light is emitted), therefore it looks dark/black.
  • But still has a lot of gravity/mass in a little spot(about the size of a small town)

Dwarf Stars

Black Hole

exit slip
Exit Slip
  • Look at the graph/image on the next slide:
  • What is the relationship between the following variables compared to size (radius):


Temperature ______________

Radius ______________

Luminosity ______________

Lifetime ______________

Abundance ______________