Life Cycle of a Star

By: Emily Hayes

Prostar

Being a nebula is the first stage of being a star. Gravity causes dust and gas to clump together, and the more mass the clumps gain, the the gravitational attraction causes the pulling more atoms to the clump. Thus, a prostar is created. In order to achieve as a star the prostar must achieve and maintian equibrillium.

Middle Sequence

The main sequence is about 90% of the stars life. This stage is the longest in the whole process. Nuclear Fusion will be happening. Nuclear fusion is the process of helium and hydrogen fusing together to create massive amounts of energy. Our sun is currently in the Middle sequence, the size of it will not change anymore.

Red Giants

This stage is for medium stars only. The center of it shrinks and the atmoshpere swells. It is running out of hydrogen and it starts to cool. It ends with a stage called planetary nebula when it slowly spreads out and scatters. a white dwarf is the end result of the center of the star. it may shine for billions of years after the enitial death.
Big image

Super Giants

This happens for large mass stars only. Same as the Red Giants, the center shrinks and atmosphere swells. It also cools and runs out of hydrogen. After the fuel is all used up, it will create a super nova, a enormous explosion after fuel has run out. A neutron star is formed after a star has collapsed and all of the particals become neutrons. After all of those stages comes the b;ack hole stage. The star will finally become a black hole, so massive, even light cannot escape. Astonomers use xrays to detect them.

Cites

Carnia Nebula. Wikimedia Commons. Web. 2 Apr. 2013. http://commons.wikimedia.org/wiki/File:Landscape_Carina_Nebula.jpg.


The Old Sun. Expected Old Age for Stars Like the Sun.. Web. 2 Apr. 2013. http://physics.uoregon.edu/~soper/StarLife/oldsun.html.

Red Giant. What is a Red Giant Star? . Web. 2 Apr. 2013. http://www.astronomycafe.net/qadir/q2958.html.

Image of the Day Gallery. NASA. Web. 2 Apr. 2013. <http://www.nasa.gov/multimedia/imagegallery/image_feature_784.html>.


Space Stars and the Beginning. The Life Cycle of a Star. Elaine Scott. Print. Pages 39 to 43. April 2, 2013


Star Life Cycle. n.d. Web. 2 Apr. 2013. <aspire.cosmic-ray.org>.


Parker, Jan. "Life Cycle of Stars." Slide Share. 16 Feb. 2010. Web. 2 Apr. 2013. <http://www.slideshare.net/jan_parker/life-cycle-of-stars-3196871>.