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# ica2-aug28 - Clicker Question#6(Prather et al#8c on page...

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Class 3, ICA #2, August 28. We did Prather et al. pages 131 and 132, and had 7 clicker questions, Clicker Question #1: This was the first question of the reading check. A scale model of the whole Solar System that has the Sun as a grapefruit would B. stretch across campus. Clicker Question #2: This was the second question of the reading check. Our Milky Way Galaxy D. has not been seen from the outside by us. Clicker Question #3: (Twin question on slide 7.) B. 11 years old. Why: Today you get the announcement that B is 13 years old. How old is she really? 16. How old is A really? Also 16 -- they're twins after all. But A is 5 ly away, so if she is really 16 right now, and it takes 5 years for a message from her to get to you, how old must she be now? Clicker Question #4: (Prather et al. #6 on page 131.) D. Crystal sent first. Clicker Question #5: (Prather et al. #8b on page 132.) D. 40 million years from now.

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Unformatted text preview: Clicker Question #6: (Prather et al. #8c on page 132.) D. 60 million years ago. Clicker Question #7: (Related to Prather et al. #9 on page 132). A. X is older. Why: Suppose they both appear to be 5 years old. Say Y is 3 ly away, and X is 5 ly away. How old are X and Y really? All answers to Prather et al. 131-132: #1: Light-year is a unit of distance, the distance light travels in one year. #2: Sydney lives 4.3 ly from the Sun. #3: 11.4 years -- Crystal's picture takes that long. #5: Yes, the farther away the child lives, the older he/she is when you actually receive his/her message. #6: Crystal sent her picture first and Sydney sent her picture last. #7: As it wasy 2.5 million years in the past. Light takes that long to travel the distance between Andromeda Galaxy and here. #8: 10 million years, 40 million years, 60 million years ago. #9: a and e...
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