2.  Nebula  Protostar  Brow Dwarf  Main sequence  Hydrogen fusion  Red Giant  Planetary nebula  White Dwarf  Black Dwarf

3. A nebula is a cloud of gas and dust. A nebula turns into a protostar after an additional amount of gas and dust contract to the original nebula. There are four different kinds of nebulae: diffuse, planertary, protoplanetary, supernova remnants. Image from: http://s244.photobucket.com/albums/gg26/soxsbabe101/?action=view&current=CatsEyeNebula.jpg Nebula

4. A protostar is a large object that’s forms from the gas of a large molecular cloud in the interstellar medium. A interstellar medium is the dust and gas spread around interstellar space. A protostar will turn in to a main sequence star once it gains enough mass, the temperature rises, and hydrogen starts to fuse. A low mass protostar is smaller than a high mass protostar. Image found at: http://media.photobucket.com/image/protostar/azharmafia/Digitalblasphemy%20Series/Pr otostar.jpg?o=3

5. A brown dwarf is a wanna’ be star but it doesn't get hot enough it be one. There are different types of brown dwarfs. There is spectral class L, spectral T, and spectral Y. Image found at:http://news.nationalgeograp hic.com/news/2006/03/images/ 060323_brown_dwarf_big.jpg

6. A main sequence is the majority of a stars life. The Sun, Sirius and Alpha Centauri A and B are all main sequence stars. The main sequence happens in the center of a star. http://aspire.cosmic- ray.org/labs/star_life/starlife_sequence.html

7. It happens in main sequence stars. It’s where hydrogen doubles into helium. It releases a lot of energy when this happens. http://en.wikipedia.org/wiki/File:Deut erium-tritium_fusion.svg

8. A red giant is a large star weighs about one-half to ten times as much as the sun. Red giant stars are actually red. Some of the main red stars are Mira, Arcturus and Gamma Crucis. http://en.wikipedia.org/wiki/Red_giant

9. Helium fusion happens when the star runs out of hydrogen so it starts fusing helium. Helium turns in to carbon. It needs to be a lot more hotter for it to work. The star runs out of helium faster than hydrogen. IMAGE FROM: http://en.wikipedia.org/wiki/File:Helium_atom_QM.svg

10. A planetary nebula is a nebula that is made up of gas and plasma. Planetary nebula is made up of certain stars when they die. Planetary stars don't last for long, compared to a star, which only lives for tens of thousands of years. http://simple.wikipedia.org/wi ki/File:Ngc2392.jpg

11.  A white dwarf is a star. The color of a white dwarf is the same as any other regular star, but just not as bright. A star like the sun will become a white dwarf once it has ran out of fuel. Most white dwarf stars are the same size as Earth, and 100 times smaller than the sun. http://en.wikipedia.org/wiki/File:Sirius_A_and_B_Hubble_photo.j pg

12. A black dwarf happens when a white dwarf cools off so much that it has so heat or light. Black dwarfs are a hypothesis, and may not be true. This is the end of the small/medium stars life. http://en.wikipedia.org/wiki/File:Color_icon_black.svg

13.  Red Supergiant  Supernova  Neutron Star  Black Hole

14.  Red supergiants are supergiant stars spectral type K or M. They are the largest type of star, in volume. they are not the largest type in mass. this phase it actually short. some starts may turn in to a blue supergiant, but most turn into a supernova! Image from: http://cse.ssl.berkeley.edu/bmendez/ay10/2000/cycle/massive.html

15.  A supernova is when a star explodes. this happiness when a start total runs out of heat and light. after they cause a burst if light that covers a whole galaxy. after this happens it may turn into a black hole or a neutron star. supernova's are very rare. the last one happened in 1604. Image from: http://en.wikipedia.org/wiki/File:Crab_Nebula.jpg

16. A neutron star is a star that is almost made up of completely neutrons. It's very small a dense. They are just the leftovers of a massive star. They rotate very fast. They come in different types. There is Pulsar, and Low Mass X-ray Binaries. http://simple.wikipedia.org/wiki/Fil e:Neutron_star_cross_section.jpg

17. a black hole is a whole with very strong gravity. light can't even escape it. scientist didn't even know that they excised until recently. http://simple.wikipedia.org/wi ki/File:Black_Hole_Milkyway.jp g

18.  http://en.wikipedia.org/wiki/Nebula http://en.wikipedia.org/wiki/Nebula  http://www.google.com/search?hl=en&safe=active&defl=en&q=define:Prot ostar&ei=B-G8SsD6KY_QM__pmc8K&sa=X&oi=glossary_definition&ct=title http://www.google.com/search?hl=en&safe=active&defl=en&q=define:Prot ostar&ei=B-G8SsD6KY_QM__pmc8K&sa=X&oi=glossary_definition&ct=title  http://en.wikipedia.org/wiki/Interstellar_medium http://en.wikipedia.org/wiki/Interstellar_medium  http://en.wikipedia.org/wiki/Interstellar_(disambiguation) http://en.wikipedia.org/wiki/Interstellar_(disambiguation)  http://en.wikipedia.org/wiki/Brown_dwarf http://en.wikipedia.org/wiki/Brown_dwarf  http://aspire.cosmic-ray.org/labs/star_life/starlife_sequence.html http://aspire.cosmic-ray.org/labs/star_life/starlife_sequence.html  http://simple.wikipedia.org/wiki/Planetary_nebula http://simple.wikipedia.org/wiki/Planetary_nebula  http://simple.wikipedia.org/wiki/White_dwarf http://simple.wikipedia.org/wiki/White_dwarf  http://en.wikipedia.org/wiki/Red_supergiant http://en.wikipedia.org/wiki/Red_supergiant  http://simple.wikipedia.org/wiki/Supernova http://simple.wikipedia.org/wiki/Supernova  http://simple.wikipedia.org/wiki/Neutron_star http://simple.wikipedia.org/wiki/Neutron_star  http://en.wikipedia.org/wiki/Black_hole http://en.wikipedia.org/wiki/Black_hole