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Critical Thinking Questions: (work on these with a partner) Post Activity/ Homework Questions: 1. Before a star forms A. Where do you think the gas and dust originally came from? 1. During the formation of a Red Giant Star, the core of a star pushes the outer shell back 2. Protostars & Main Sequence Stars only enough to make the star larger. A. Why is a protostar not classified as an actual star? & what needs However, during the formation of a planetary to occur for a star to transform from a Protostar to an actual star? nebula, the outer shell of a star gets pushed way out into the solar system. Explain how and why you think this difference is caused. In other words, explain how and why the outer shell is pushed out a little bit vs. pushed B. Why is our sun classified as a “Main Sequence Star?” out far away. C. Describe what needs to happen to our sun for it to transform into a Red Giant. & Will this happen to our Sun? When? D. Complete the following Venn Diagram 2 facts 2 facts 2. Average sized stars like our Sun do not explode as supernova, but super-massive stars What is Unique to How are both do. Both types of stars undergo nuclear Protostars? Similar? fusion and have an outer shell influenced by gravity. Explain why a star like our Sun will not go supernova, but a super-massive star will. Explain your answer describing the processes of nuclear fusion and gravitational force. 3. Stars do not have enough energy to fuse elements heavier than iron. If this is true, how and why are elements that are heavier than iron created? 4. Once you figured out question #3, identify how the following elements were created: Element How was it created Oxygen 2 facts What is Unique to Actual Stars 3. Red Giant vs. White Dwarf Star Complete the Venn Diagram: 2 facts 2 facts 2 facts What is Unique How are both What is Unique during the formation formations Similar? during the formation of Red Giants of a White Dwarf 4. Planetary Nebula & New Stars A. Use the Internet to research the reason why Planetary Nebula's a are named so, even though they have nothing to do with planets Gold Carbon Lead B. Describe the process that would need to take place for a planetary nebula to form a whole new star. \/ SCROLL DOWN FOR KEY \/ SCROLL DOWN FOR KEY \/ Critical Thinking Questions: (work on these with a partner) 1. During the formation of a Red Giant Star, the core of a star pushes the outer shell back only enough to make the star larger. However, during the formation of a planetary nebula, the outer shell of a star gets pushed way out into the solar system. Explain how and why you think this difference is caused. In other words, explain how and why the outer shell is pushed out a little bit vs. pushed out far away. During Red Giant formation, the core fuses a new element (Helium) and the star restabilizes. Once Helium runs out, fusion can't continue in the core and gravity is the only force left. The core can't balance the shell anymore and kicks it away one last time. 2. Average sized stars like our Sun do not explode as supernova, but super-massive stars do. Both types of stars undergo nuclear fusion and have an outer shell influenced by gravity. Explain why a star like our Sun will not go supernova, but a super-massive star will. Explain your answer describing the processes of nuclear fusion and gravitational force. Because a super-massive star has more mass, it has a larger fusion force and gravitational force. When fusion stops in the core of a super-massive star, the gravitational force is so strong on the core, that the star explodes. 3. Stars do not have enough energy to fuse elements heavier than iron. If this is true, how and why are elements that are heavier than iron created? The explosion of a supernova gives off a lot more energy to fuse heavier elements 4. Once you figured out question #3, identify how the following elements were created: Element How was it created Oxygen Post Activity/ Homework Questions: 1. Before a star forms A. Where do you think the gas and dust originally came from? The Big Bang 2. Protostars & Main Sequence Stars A. Why is a protostar not classified as an actual star? & what needs to occur for a star to transform from a Protostar to an actual star? A protostar is not an actual star because fusion doesn't occur. To become an actual star, nuclear fusion needs to occur. B. Why is our sun classified as a “Main Sequence Star?” The force of fusion in the core is balanced with the shells gravity C. Describe what needs to happen to our sun for it to transform into a Red Giant. & Will this happen to our Sun? When? Our sun needs to run out of hydrogen and begin fusing helium This will happen to our sun in 5 billion years D. Complete the following Venn Diagram 2 facts 2 facts What is Unique to How are both Protostars? Similar? 2 facts What is Unique to Actual Stars Nuclear Fusion does not occur They both contain gas Nuclear fusion occurs and dust It does not create & give off light They both have a core It creates & gives off and an outer shell light 3. Red Giant vs. White Dwarf Star Complete the Venn Diagram: 2 facts 2 facts 2 facts What is Unique How are both What is Unique during the formation formations Similar? during the formation of Red Giants of a White Dwarf The star begins by Both formations fusing hydrogen & begin by fusing ends by fusing helium something. The outer shell remains held to the star The star begins by fusing helium & ends by not fusing anything at all. Both involve the core pushing the outer The outer shell doesn't shell of the star remain held to the star 4. Planetary Nebula & New Stars A. Use the Internet to research the reason why Planetary Nebula's a are named so, even though they have nothing to do with planets Gold Carbon Lead B. Describe the process that would need to take place for a planetary nebula to form a whole new star.