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The Life Cycle of a Star. Nebula. Giant clouds of gas and dust The birthplace of stars!. Eagle Nebula: 9.5 Light Years Tall!. http://hubblesite.org/gallery/tours/tour-m16/. Creation of a Star.

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nebula
Nebula
  • Giant clouds of gas and dust
  • The birthplace of stars!
eagle nebula 9 5 light years tall
Eagle Nebula: 9.5 Light Years Tall!

http://hubblesite.org/gallery/tours/tour-m16/

creation of a star
Creation of a Star
  • Hydrogen gas is pulled together by gravity. It begins to spin, heats up, and becomes a star.
slide8

Cool Fact: Hydrogen in its core is converted into helium– this creates massive amounts of heat and light energy (this is called nuclear fusion)

average stars such as our sun
Average Stars (such as our sun)
  • Lifetime: Approximately 9 billion years as a main sequence star
slide12

 Hydrogen runs out. The outer layers of the star cool and expand outward

  • Red Giant – cool, large, red star
  • Cool Fact: When this happens to our Sun, scientists hypothesize that it will extend out as far as the Earth or even Mars.
slide14

 The core of the Red Giant collapses and becomes a White Dwarf. The outer layers of the star drift away.

  • White Dwarf – Small, dense star
  • Cool Fact: Typically, a white dwarf has a radius equal to about 0.01 times that of the Sun, but it has a mass roughly equal to the Sun's. This gives a white dwarf a density about 1 million times that of water!
slide16

When the white dwarf runs out of energy, it eventually cools to become a black dwarf

  • Black Dwarf – small, dead star
path 2 massive stars
Path #2: Massive Stars!
  • Lifetime = approximately 10 million years
  • Size = 10-1000 times the size of the Sun!
slide19

Hydrogen runs out. The outer layers of the star cool and expand outward.

  • Red Super Giant – Very large, cool, red star
slide22

When a star dies, it explodes into a radioactive cloud.

  • Supernova =extremely bright explosion (brighter than an entire galaxy)!
  • Kepler’s Supernova
slide25

What is left after the Supernova is Neutron Star.

  • Neutron Star/Pulsar: When a Neutron Star begins to rotate, it is called a Pulsar.
  • Cool Fact: According to astronomer and author Frank Shu, "A sugar cube of neutron-star stuff on Earth would weigh as much as all of humanity!" Neutron stars can be observed as pulsars.
slide26

The core of a more massive star will collapse and create a black hole.

  • Gravity becomes so strong not even light can escape (which is why it’s called a “black hole”)
  • Video: Simulation of gravitational lensing by a black hole, which distorts the image of a galaxy in the background
cool picture this is a simulated view of a black hole in front of the large magellanic cloud
Cool Picture: This is a simulated view of a black hole in front of the Large Magellanic Cloud.
  • http://commons.wikimedia.org/wiki/File:BH_LMC.png