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Transcript
Star Life Cycle Web Quest Physical Earth and Space Science Names: _________________________________________________ Date:____/___/_____ Period:_____ Website: http://sunshine.chpc.utah.edu/labs/star_life/starlife_main.html or go to cullenscience.wikispaces.com and open the link to Life Cycle of a Star. Directions: Use the information from the Life Cycle of a Star Website to answer/fill in the following questions/blanks about stars. Score:____/ 50 Protostars and the Nebula 1. A_____________________is a cloud of dust and gas, composed primarily of hydrogen (97%) and helium (3%). 2. Adding atoms to the center of a protostar is a process astronomers call _______________. 3. In order to achieve life as a star, the protostar will need to achieve and maintain ___________. What is equilibrium? It is a balance, in this case a balance between gravity pulling atoms toward the center and gas pressure pushing heat and light away from the center. Achieving and keeping this ____________ is tough to do. When a star can no longer maintain equilibrium, it __________. 4. How does equilibrium work? There are 6 parts to it. 1. 2. 3. 4. 5. 6. 5. What is the difference between a brown dwarf and protostar? Stars 1. What is a star? : 2. Stars live out the majority of their lives in a phase termed as_________________________. 3. What happens during this phase? 4. During the life cycle of a star there is a constant battle between __________________ and___________________. A Matter of Mass 1. Homeostasis means _______________ or_________________. 2. Choose from the following hypotheses regarding length of star life: 1) The bigger a star is, the longer it will live. 2) The smaller a star is, the longer it will live. Now, for whichever hypothesis you chose, type a 1-3 sentence explanation for why you think this is so. 3. __________ stars have more fuel, but they have to burn (fuse) it faster in order to maintain equilibrium. Therefore, ____________stars live longer than __________ stars because their rate of fuel consumption is not as rapid. Equilibrium 1. The two sections of a star are: 2. The life goal of a star is to achieve _______________________. 3. List the 5 steps of Equilibrium: 1. 2. 3. 4. 5. 4. Stars primarily burn _________________. 5. How long it takes for a star to die depends upon its_______________________. Stars: The beginning of the end 1. Remember, to remain ___________ the star must balance the gas pressure pushing out and the ________________ force pulling in. Gravity will cause the core to contract. Helium burns inside the ________, but a rapid hydrogen reaction occurs faster in the ___________of the star. As the temperature in the shell of the star increases, the outer layers of the star expand. 2. What is a Red Giant? 3. ___________ is releasing more energy during helium burning than at the main sequence stage, so the star is bigger, but less stable. Eventually, the core will run out of ___________, and in order to maintain __________________, the core will contract again to initiate the last type of fusion –__________________. CARBON BURNING: Death 1. We do know that a star, regardless of its size, must eventually ________________________________________________________. 2. What are the 3 categories of stars? Watch each of the videos about how each type of star is formed. 3. Give 3-5 characteristics/facts for each category of Stars 1. Category 1________________: 2. Category 2________________: 3. Category 3________________: