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phys 020 HW1 - the stars should appear to change position...

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1. False 2. A 3. B 4. B 5. C 6. A 7. C 8. A 9. A 10. C 11. False:  Our solar system is made up of a single star (SUN) and the planets and objects that orbit  that star.  Galaxies are made of millions or billions of stars. 12. False 13. False.  Every year we can see one more light year into the distance Some parts of the  Universe may simply be too far away for the light from there to have reached Earth. Due  to the expansion of space, at a later time they could be observed. The  observable  Universe  is expanding at one light year per year, because we can see that much further  each year. The overall  Universe  is expanding much faster than that, depending upon  how much bigger it is. 14. True  15. B 16. B
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17. False 18. D 19. C 20. C 21. A 22. C  : earth and other planets go around the Sun, not Earth-centered. consequence of  Earth's motion is stellar  parallax . If  Earth  changes its position relative to the stars, than 
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Unformatted text preview: the stars should appear to change position in the course of the year. parallax arises from the change of Earth's position and depends on the distance to the star. Aristotle himself mentioned the lack of observable stellar parallax as the proof that the Earth is not moving (stationary). Annual parallax is caused by the Earth's yearly orbit around the Sun. 23. C 24. B 25. A 26. A 27. C 28. B (Kepler’s 2 nd Law) 29. B 30. C 31. C 32. A 33. TRUE 34. B 35. A 36. A 37. C 38. A 39. C: we see countless stars and vast interstellar clouds." "only when we look in directions away from the galactic disk, so that ther are relatively few stars and clouds to block our view." P.28 40. B 41. A 42. C 43. A: they never rise or set but instead make daily counterclockwise circles around the north celestial pole pg. 31 44. FALSE 45. C...
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