2.  Page 1: Front Page  Page 2: Table of contents  Page 3: Understanding Question 3  Page 4: Understanding Question 4  Page 5-11: 1. Nebula & Main sequence 2. Helium & Hydrogen Fusion 3. Proto & Neutron Star 4. Red & Super Giant 5. Super Nova & Planetary Nebula 6. Dwarfs 7. Black Hole  Page 12: Sources

3. Understand Question 1  How are stars formed?  Stars are made in nebulas. When big stars die, they explode. This is called a supernova. When a supernova occurs in a nebula it causes the nebula to collapse forming stars. Eagle Nebula

4. Understand Question 2  Why do low-mass & high-mass stars take different paths at the end of life?  Low-mass & high-mass stars take different paths at the end of life because a low-mass star stops fusing and the outer layers of it gets driven away but the high-mass star collapses and creates a huge explosion. < Planetary Nebula (Low Mass) (High Mass)Super Nova>

5. Nebula and main sequence  Nebula : A cloud in a galaxy containing dust, gas,and plasma. (Shown Above)  Main Sequence: A phase in which stars live out the majority of their lives. (Below)

6. Helium and Hydrogen Fusion  Helium fusion: A kind of nuclear fusion, with the nuclei involved being helium. (Look at Triple alpha process)  Hydrogen fusion: When four Hydrogen nuclei (protons) come together to make a Helium nucleus. (Right >)

7.  Protostar: A protostar is a large object that forms by contraction out of gas in the interstellar medium.  Neutron Star: A super dense core of a star that’s left over after a Super Nova. Protostar & Neutron Star Protostar > <Neutron Star

8.  Red Giant: A small to medium main sequence star. When it runs out of hydrogen it starts fusing helium. (Right>)  Super Giant: A massive main sequence star. When it runs out of hydrogen. It starts fusing helium,carbon,oxygen, and etc. (Right>)

9.  Super Nova: When a Red Supergiant stops its fusion. The star collapses and creates a huge explosion known as a supernova.  Super Nova>  Planetary Nebula : When a red giant completely stops fusing the outer layers of the star has been driven away. Super Nova & Planetary Nebula

10.  Black  Black Dwarf: A black dwarf is when the white dwarf cools off over millions of years until it no longer emits light. (Upper Right)  Brown  Brown Dwarf: A protostar that is too small to create enough heat to start fusion  (Middle right)  White  White Dwarf: The left over of a star. It may be the size of the earth and the mass of the sun. (Bottom Right)

11.  An object in the universe that has such a strong gravity, even light cant escape it.

12. Sources Name/Source/Page Pictures: Nebula/Planetary Nebula: Picture: http://en.wikipedia.org/wiki/File:Eagle_nebula_pillars.jpghttp://en.wikipedia.org/wiki/File:Eagle_nebula_pillars.jpg [Page 2] http://en.wikipedia.org/wiki/File:Omega_Nebula.jpghttp://en.wikipedia.org/wiki/File:Omega_Nebula.jpg [Page 5] http://en.wikipedia.org/wiki/File:Keplers_supernova.jpghttp://en.wikipedia.org/wiki/File:Keplers_supernova.jpg [Page 3/9] Super Nova: http://en.wikipedia.org/wiki/File:Keplers_supernova.jpghttp://en.wikipedia.org/wiki/File:Keplers_supernova.jpg [Page 3] http://heasarc.gsfc.nasa.gov/docs/snr.htmlhttp://heasarc.gsfc.nasa.gov/docs/snr.html [Page 9] Black Hole: http://simple.wikipedia.org/wiki/Black_holehttp://simple.wikipedia.org/wiki/Black_hole [Page 11] http://imagine.gsfc.nasa.gov/docs/science/know_l1/black_holes.htmlhttp://imagine.gsfc.nasa.gov/docs/science/know_l1/black_holes.html [Page 11] Star life cycle chart: http://aspire.cosmic-ray.org/labs/star_life/starlife_sequence.htmlhttp://aspire.cosmic-ray.org/labs/star_life/starlife_sequence.html [Page 5] http://library.thinkquest.org/C0110277/images/Starlifecycle_full.gifhttp://library.thinkquest.org/C0110277/images/Starlifecycle_full.gif [Page 1] http://en.wikipedia.org/wiki/File:Sun_Life.pnghttp://en.wikipedia.org/wiki/File:Sun_Life.png [Page 1] Hydrogen/Helium Fusion: http://www.windows.ucar.edu/sun/Solar_interior/Nuclear_Reactions/Fusion/Fusion_in_stars/pp_fusion.jpghttp://www.windows.ucar.edu/sun/Solar_interior/Nuclear_Reactions/Fusion/Fusion_in_stars/pp_fusion.jpg [Page 6] http://en.wikipedia.org/wiki/File:Triple-Alpha_Process.pnghttp://en.wikipedia.org/wiki/File:Triple-Alpha_Process.png [Page 6] Protostar/Neutron Star: http://www.space-art.co.uk/pages-en/stars-I/Protostar.htmhttp://www.space-art.co.uk/pages-en/stars-I/Protostar.htm [Page 7] http://universe.nasa.gov/press/images/neutron/neutron_accretion.gifhttp://universe.nasa.gov/press/images/neutron/neutron_accretion.gif [Page 7] Red/Super Giant: http://www.astro.keele.ac.uk/workx/starlife/sun5_20.gifhttp://www.astro.keele.ac.uk/workx/starlife/sun5_20.gif [Page 8] http://imgsrc.hubblesite.org/hu/db/images/hs-2005-02-f-web.jpghttp://imgsrc.hubblesite.org/hu/db/images/hs-2005-02-f-web.jpg [Page 8] Black/Brown/White Dwarfs: http://www.dorlingkindersley-uk.co.uk/static/clipart/uk/dk/sci_space/image_sci_space013.jpghttp://www.dorlingkindersley-uk.co.uk/static/clipart/uk/dk/sci_space/image_sci_space013.jpg [Page 10] http://www.daviddarling.info/images/brown_dwarf_size.jpghttp://www.daviddarling.info/images/brown_dwarf_size.jpg [Page 10] http://en.wikipedia.org/wiki/File:Sirius_A_and_B_Hubble_photo.jpghttp://en.wikipedia.org/wiki/File:Sirius_A_and_B_Hubble_photo.jpg [Page 10] Information: http://simple.wikipedia.org/wiki/Star http://en.wikipedia.org/wiki/Helium_fusion http://simple.wikipedia.org/wiki/Black_hole http://www.windows.ucar.edu/tour/link=/sun/Solar_interior/Nuclear_Reactions/Fusion/Fusion_in_stars/H_fusion.html http://en.wikipedia.org/wiki/Triple-alpha_process [Notes] Lifecycle of a star Notes Star life cycle Notes