 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

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

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>

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)

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 >)

 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

 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>)

 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

 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)

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

Sources Name/Source/Page Pictures: Nebula/Planetary Nebula: Picture: [Page 2] [Page 5] [Page 3/9] Super Nova: [Page 3] [Page 9] Black Hole: [Page 11] [Page 11] Star life cycle chart: [Page 5] [Page 1] [Page 1] Hydrogen/Helium Fusion: [Page 6] [Page 6] Protostar/Neutron Star: [Page 7] [Page 7] Red/Super Giant: [Page 8] [Page 8] Black/Brown/White Dwarfs: [Page 10] [Page 10] [Page 10] Information: [Notes] Lifecycle of a star Notes Star life cycle Notes