May 9, 2012Warm 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

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

Is the sun a star?

• Discussion:

• http://www.youtube.com/watch?v=hMMqbfQvU6w

Are all stars the same as the sun?

• Discussion:• http://www.youtube.com/watch?

v=Yv_KhxxKhgc&feature=results_video&playnext=1&list=PL8F2E526A4B6555E2

• http://www.youtube.com/watch?v=HvTPUuUgowk (turn on captions for English)

• http://www.youtube.com/watch?v=01U7ZUKVW8o (hands on activity to show why)

• http://www.youtube.com/watch?v=R6_dZhE-4bk&feature=related (history of stars)

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?• _____________________________________________________________________________________________________

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• 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?

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• Sort your star cards by temperature, from coolest to hottest.• _____________________________________________________________________________________________________

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• 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.

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• 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.

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