1. By; Rachel Life Cycle of Stars!

2. How stars are formed. 1; All stars form from cloud of gas (nebulae). Stars that have more mass than 6 solar masses are expected to supernova! Stars that have less mass than that turn into white dwarfs. http://imagine.gsfc.nasa.gov/docs/ask_astro/answers/970422f.html

3.  A nebula is and interstellar cloud of dust.  Nebula was originally a general name referring to any extended astronomical object http://en.wikipedia.org/wiki/Nebula The Eagle Nebula! clounaghscience.wordpress.com/

4. Supernova A supernova is when a very big star EXPLODES. This happens when a star runs completely out of energy to produce heat and light. The biggest supernovas are hyper giants. The smallest supernovas are supergiants. http://simple.wikipedia.org/wiki/Supernova A supernova! www.lawlibrary.co.za/.../2007/issue_16.htm

5. White Dwarf A white dwarf is a star formed mostly of electron- degenerate matter. A white dwarfs mass is comparable to that of our sun’s. White dwarfs! Science.nationalgepgraphic.com/science/photos/white- dwarfs-gallery.html http://en.wikipedia.org/wiki/White_dwarf

6. How stars are formed. 2; Following a supernova, if the remaining part has a mass more than 3 solar massed, it turns into a black hole. When they are burning hydrogen into helium, stars are their smallest. This occurs during the majority of their life. http://imagine.gsfc.nasa.gov/docs/ask_astro/answers/970422f.html

7. Black Hole A black hole is a figure in the universe that has such a mighty pull of gravity that even light can’t get away. Many astronomers didn’t know of its existence until recently. http://simple.wikipedia.org/wikli/Black_hole A black hole! wopat.uchicago.edu/

8. Hydrogen Fusion Hydrogen fusion is a cycle where four hydrogen nuclei form together to make a helium nucleus. Hydrogen fusion is a cycle where four hydrogen nuclei form together to make a helium nucleus. Electrons, protons, and neutrons are involved in the course of hydrogen turning into helium. Electrons, protons, and neutrons are involved in the course of hydrogen turning into helium. http://www.windows.ucar.edu/tour/link=/sun/Solar_interior/Nuclear_Reaction s/Fusion/Fusion_in_stars/H_fusion.html http://www.windows.ucar.edu/tour/link=/sun/Solar_interior/Nuclear_Reaction s/Fusion/Fusion_in_stars/H_fusion.html Hydrogen fusion process! outreach.atnf.csiro.au/…/stars_types.html

9. Helium Fusion Helium fusion is a kind of nuclear fusion. http://en.wikipedia.org/wiki/helium_fusion science.howstuffworks.com/energy-form-space.htm

10. How stars are formed. 3; While stars are burning hydrogen into helium, they are sometimes called “dwarfs.” There are white dwarfs, and brown dwarfs. http://imagine.gsfc.nasa.gov/docs/ask_astro/answers/970422f.html

11. Brown Dwarf  Brown Dwarf is an expression for an object in space that is bigger and different that is bigger and different than planets, than planets, but its not a but its not a true star. true star.http://simple.wikipedia.org/wiki/Brown_dwarf news.nationalgeographic.com/news/2006/03/0323_0603 23_brown_dwarf.html

12. Why low-mass and high-mass stars take different paths. Low-mass stars and high-mass stars take different paths at the end of their lives because high-mass stars become so compact that they have to do something different than low-mass stars. Low-mass stars and high-mass stars take different paths at the end of their lives because high-mass stars become so compact that they have to do something different than low-mass stars.http://wiki.answers.com/Q/Why_low-mass_high-mass_stars_take_different_paths_at_the_end_of_their_life

13. VOCABULARY FOR STARS! other

14. Protostar A protostar is a large object that forms by decrease out of gas a giant molecular cloud in the interstellar medium. The protostellar phase is an early stage in star formation http://en.wikipedia.org/wiki/Protostar A protostar! Physics.ship.edu/~mrc/pfs/108/node3.htm

15. Main Sequence Star A main sequence star is a continuous and extraordinary chain of stars that appear on the plots of stellar color versus brightness. http://en.wikipedia.org/wiki/Main_sequence_star Main sequence star! www.sciencecodex.com/surface_details_of_altair

16. Red Giant A red giant is a very big star that weighs about one half to ten times as much as our sun. A red giant is a very big star that weighs about one half to ten times as much as our sun. They are called red giants because they look red and are very big. They are called red giants because they look red and are very big. Many red giants could fit thousands and thousands of suns, like the one in our solar system, inside them! Many red giants could fit thousands and thousands of suns, like the one in our solar system, inside them!http://simple.wikipedia.org/wiki/Red_giant www.skyofplenty.com/?page_id=374

17. Planetary Nebula A planetary nebula is a nebula made up of gas and plasma. A planetary nebula is a nebula made up of gas and plasma. Planetary nebulae are called this because if you look at them through optical telescopes, they look like planets. Planetary nebulae are called this because if you look at them through optical telescopes, they look like planets. They are made of particular stars when they die. They are made of particular stars when they die.http://simple.wikipedia.org.wiki/Planetary_nebula Commons.wikimedia.org/wiki/File:Planetary.Nebula.Formation.png A planetary nebula!

18. Neutron Star  Neutron stars are very small and dense stars that hare made almost entirely out of neutrons.  A neutron star is a large nucleus held together by gravity.  A neutron star’s radius is about 10 kilometers and its mass is about 1.4 to 5 times the sun’s mass. http://simple.wikipedia.org/wiki/Neutron_star Commons.wikimedia.org/wiki/File:Neutron_star_cross_section.jpeg

19. Supergiant A supergiant is a larger star than our sun. It has a short life span of 10-50 million years because or its large mass They can be red (which are cold) or blue (which are hot). http://www.faq.com/qa/qa_10705.html cse.ssl.berkeley.edu/…/cycle/supergiant.html Red supergiant!

20. Black Dwarf Black dwarf is when a white dwarf becomes too cool to create large amounts of heat and light. Although, black dwarfs are not proved to exist because it takes a white dwarf longer than the current age of the universe to turn into one. http://simple.wikipedia.org/wiki/Black_hole Theyorf.blogspot.com/2007/08/li ves-of-stars.html A dead black dwarf star!