1. May 9, 2012 Warm Up 1.Take out journal 2.Take out Activity #2 worksheet from yesterday 3.Make sure name and class period are at top and ready to turn in 4.Will collect once attendance is taken

2. Activity #2 1.Venus is to hot : boil Mars is to cold: freeze 2. Water will boil / to hot 3. Water will freeze / to cold 4. law of Habitability would decrease / the suns heat would reach farther out 5. law of Habitability would increase / more planets may be able to maintain life that are closer to the sun. Grades: 0=100 1=90 2=80 3=70 4=60 5=50

3. Is the sun a star? Discussion: http://www.youtube.com/watch?v=hMMqbf QvU6whttp://www.youtube.com/watch?v=hMMqbf QvU6w

4. Are all stars the same as the sun? Discussion: http://www.youtube.com/watch?v=Yv_KhxxKhg c&feature=results_video&playnext=1&list=PL8F 2E526A4B6555E2http://www.youtube.com/watch?v=Yv_KhxxKhg c&feature=results_video&playnext=1&list=PL8F 2E526A4B6555E2 http://www.youtube.com/watch?v=HvTPUuUgo wk (turn on captions for English)http://www.youtube.com/watch?v=HvTPUuUgo wk http://www.youtube.com/watch?v=01U7ZUKVW 8o (hands on activity to show why)http://www.youtube.com/watch?v=01U7ZUKVW 8o http://www.youtube.com/watch?v=R6_dZhE- 4bk&feature=related (history of stars)http://www.youtube.com/watch?v=R6_dZhE- 4bk&feature=related

5. Let’s investigate: Activity #4 The Sun is a Star? Activity #4 The Sun Is A Star? Obtain a set of “Star Cards” from your teacher. Examine each star card and using the information provided sort, the stars by their distance from the Earth, from largest to smallest. Does the star’s temperature appear to depend on the distance from the Earth? ______________________________________________________________________________________________________ ______________________________________________________________________________________________________ ______________________________________________________________________________________________________ ______ Compare the color of the star to its temperature. Compare the spectral class of the star to its temperature. Do the color or spectral class of the star appear to be related to the star's temperature? ______________________________________________________________________________________________________ ______________________________________________________________________________________________________ ______________________________________________________________________________________________________ ______ Sort your star cards by temperature, from coolest to hottest. ______________________________________________________________________________________________________ ______________________________________________________________________________________________________ ______________________________________________________________________________________________________ ______ E.Consider the four characteristics (1) Temperature, (2) color, (3) distance, and (4) class or spectral type. Which characteristics most strongly influence the size and location of the habitable zone? Explain your reasoning for each. ______________________________________________________________________________________________________ ______________________________________________________________________________________________________ ______________________________________________________________________________________________________ ______ F.If we are looking for Earth-like life elsewhere in the universe, which of the stars described on the star cards would you explore first? What spectral classes did you choose? Explain the reasoning behind your choices. ______________________________________________________________________________________________________ ______________________________________________________________________________________________________ ______________________________________________________________________________________________________ ______ Scientists believe that life as we know it is most likely to exist around stars most like our Sun, in the F, G and K classes. Size, temperature and light appear to be important factors in identifying these stars. How would the zone of habitability be different around an "F" star, or a "K" star as compared to the Sun? Explain your reasoning. ______________________________________________________________________________________________________ ______________________________________________________________________________________________________ ______________________________________________________________________________________________________ ______