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Stellar Evolution: The Life Journey of Stars

Explore the fascinating lifecycle of stars from birth in nebula to final stages like Supernovas and Neutron stars. Learn about classifications, stages, and cosmic phenomena along the way.

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Stellar Evolution: The Life Journey of Stars

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  1. Life of a Star by Stacia Deutsch and RhodyCohon

  2. Introduction • Over time Astronomers invented new tools. • Then they finally, they discover how stars fade from the sky using tools they invented.

  3. Birth of a Star • Scientists divide stars into different groups called spectral classes. • There are 7 classes: O,B,A,F,G,K and M. • Stars are classified by temperature and by weight, radius, and luminusity, or how much light the star gives off.

  4. Nebulas • All stars begin in a nebula. • Nebulas contain mainly hydrogen gas and a small amount of helium gas. • Emission nebulas is one of the types of nebula.

  5. Nebulas • Nebula rotates or spin. • Cause-Protoplanetary disk was here for 10m years • Effect-It disappears after years.

  6. Protostar • The protostar shoots off its gas jets through its protoplanetary disk.

  7. Protostar continues • A star’s mass determines whether it moves on to the next stage • The star also gives off rays of light and energy. A star remains in this main sequence for most of it’s life.

  8. Part of a Star • All the parts that stars in this life stage share are: Radiactive zone, convection zone, chromosphere zone, and soicoles zone and corona zone.

  9. Part of a Star • One of the most massive stars known today is Eta Carina. Eta Carina is highly unstable.

  10. Red giant stage • Some red giants may regain stability for a while. Then, they begin the red giant stage a second time. • One day our sun. Like all medium & smaller stars, will become a red giant. • After a red giant has created a Planetary Nebula.

  11. White/Black Dwarfs • Cause-A while dwarfs are so hot that they still are low. But eventually, white dwarfs cool to temperature sop low. • Effect-They will be in their final life stage,

  12. Red supergiants • Their gravity causes the outer layers to colapse inward. • Then, the matter reheats. Nuclear fusion begins again and the stars swells and glows a reddish color.

  13. supernovas • Supernous blast gas and debris far into space. • These particles spread out or may form a new nebula.

  14. Neutron • All neutron stars rotate, but some also ”twinkle”. Pulsars are spinning neutron stars. • The supernova 1987 A exploded approximately 160,000yrs ago. The light Earth until reach February 23, 1987

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