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Learning goals for Astronomy’s Final 2016 For each of the subtopics, be able to… Big bang 1. Give an overview of the big bang theory for Universe evolution. 2. Describe evidence for the big bang: anti-matter has been created and isolated on particle accelerators. Anti-matter also occurs at stars and borders of black holes (Event Horizon), Hubble’s Law, Cosmic Background radiation. 3. Describe the need for inflation period, and describe prediction for which scientists are currently searching. Unit conversions 4. Define the following units used in astronomy: o Astronomical Unit, light year, and parsec 5. Describe when do we use each of these units 6. Perorm unit conversions between the length units used in astronomy Coordinate systems: Azimuth and altitude; right ascension and declination 7. Explain azimuth and altitude as parts of a celestial coordinate system. Include when are they useful 8. Find objects in the sky by computing altitude and azimuth using your hand o If your fist fits 9 times between the horizon and the zenith, it covers 10o. Explain why o find how many degrees a hand has if it spans a given amount of times between horizon and zenith 2. Describe an astrolabe, and explain its importance to sailors. 3. Explain right ascension and declination as parts of a coordinate system, and explain why do we need them to locate celestial objects. Be sure to know their units. 4. Apply the method of right ascension and declination to find celestial bodies. o Find the right ascension and declination with the mini planetarium. 5. Define the following terms, and locate them on Earth: o Ecliptic o Equatorial plane o Equinoxes and solstice o Tropical lines 6. Define the term circumpolar star and identify which stars are never visible from a particular location Reasons for the Seasons 7. Explain the reasons for the seasons Telescopes 8. Describe the basic idea behind a telescope (define a telescope). 9. Explain and identify types of telescopes: refractors and reflectors 10. Describe the basic mechanism of a telescope: o Explain what makes a telescope more powerful than another o Explain what part is responsible for magnifying the image 11. Describe what makes the Hubble telescope special Theories and facts, why do Astronomers believe in the Big Bang? 12. 13. 14. 15. Describe and differentiate between facts, hypothesis and theories in the scientific process Describe what makes science “self-correcting” Defend your point of view about science being “self-correcting” Describe how does Plato’s quote explain the scientific process? Hubble’s data, the first strong evidence 16. 17. 18. 19. Provide the interpretation of Hubble’s data and explain how it supports the idea of the Big bang. Be able to interpret Hubble’s graph and extrapolate values from it. Be able to interpret a plot with a direct linear relationship (like Hubble’s) Use Hubble’s data to find the age of the Universe. 20. Do time unit conversions when calculating the age of the universe Judging the size of a celestial object: size distance relationship 21. Describe the difference between size and apparent size of an object. 22. Describe and apply methods for measuring the apparent size of objects by size/distance ratio method and angular distance. o Solve a problem of the type: The Pleiades, a star cluster in the constellation of Taurus the bull, appears about one finger width big in the sky. If the cluster were about 7 light-years in diameter, how far would the cluster be? Give your answer in light years. o Do calculations to “eclipse” different balls. Video on light 23. Explain the evolution of a scientific model based on the model for light. 24. Know of the most important individuals that have worked on creating the current model of light, and the models they have proposed o Newton o Huygen o Maxwell and Hertz o Planck and Einstein 25. Explain the current model of light. In particular, be able to describe the particle model (photons) as well as the wave model (electromagnetic waves) in a descriptive way. 26. Describe the parts of a wave. (crest, trough, wave length, amplitude, frequency, period, wave speed) Electromagnetic spectrum (EMS) = Light 27. List the components of the electromagnetic spectrum and organize the spectrum according to wave properties. 28. Know the speed of light with the correct units 29. Explain the relationship between frequency and wavelength for electromagnetic waves (EMW) based on the speed of EMW. Explain also the relationship between frequency, wavelength and energy for EMW. 30. explain why Astronomers look at the Universe in all frequencies of EMW Black body radiation 31. 32. 33. 34. Define a black body Describe what a black body spectrum tell us. Describe absorption, reflection and transparency. Apply Wien’s displacement law for black bodies to find the temperature of an object based on its black body spectrum (T * max =2.898 x 107 Å oK). Problem Continuous spectrum, Spectral tubes and Decoding Cosmic Spectra 35. 36. 37. 38. Describe the continuous spectrum. Describe the line spectrum for gases. Describe the difference between an emission spectrum and an absorption spectrum. Describe light spectroscopy as a method used by Astronomers to find the composition of different celestial objects o use emission spectra to find the composition of a star. o Be able to make connections between Kirchoff’s law (elements absorb electromagnetic energy at the same frequencies at which they emit the electromagnetic energy) and the method for determining planet’s atmospheric composition. Doppler shift 39. 40. 41. 42. Describe the Doppler shift, which is produced when a wave source moves relative to receptor Interpret Doppler diagrams Tell the difference between redshift and blueshift Describe how the Doppler shift is used on Astronomy o Ex. Be able to apply Doppler effect to explain the redshift in astronomy for measuring speed away from Earth, as Hubble did while studying galaxies. Cosmic background radiation 43. Describe what is the cosmic background radiation and how it was discovered 44. Explain the importance of the discovery of the cosmic background radiation (strong evidence that supports the model of the Big Bang) 45. Explain the importance of COBE’s discoveries, as well as WMAP and Planck (the inhomogeneity of the CMB) Deep field 46. Describe and apply the process by which scientists count and catalog celestial bodies as seen from Deep Field images 47. Explain the importance of the Hubble telescope and the Deep Field images, as well as what makes it so different from other telescopes, and the Deep Field images. Dark matter and Dark Energy 48. Explain the evidence that support the idea of dark matter in the universe 49. Explain the evidence that support the idea of dark energy in the universe Galaxies 50. Classify galaxies 51. Explain galaxy formation Black holes 52. Describe black holes o Define event horizon o Explain two types of black holes, and explain their genesis o Describe the size limit for black holes Star color and H-R diagram 53. Describe the different form in which Astronomers look at brightness and classify stars (Magnitude, colour, spectral class) 54. Find the color of a star based on spectral data (B-V, etc) 55. Interpret star color and connect that to the star’s surface temperature 56. Describe what is an H-R diagram 57. Construct H-R diagrams using the concept of color and star’s temperature 58. Describe the different star groupings in terms of H-R diagrams: Main sequence, giants and super giants, white dwarfs Stellar evolution 59. Describe the life cycle of stars 60. Explain where do elements in the periodic table come from 61. interpret H-R diagrams in terms of the life cycle of stars Star clusters 62. Define and describe star clusters and the two types of star clusters 63. Describe how H-R diagrams are used for estimating the age of a cluster. Explain the big assumption used in this method. 64. Find the relative age of two clusters based on their H-R diagrams