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Tucson 1975 Tucson 1995 Bit of Administration …. • Reading – BSNV Chaps. 7 and 8 • Particularly important discussion section don’t miss this week • Additional observations for Lab 2, through April 5 And the Winners are … • 4th Runner up • 3rd Runner up • Rocket Man Jordan Gaster Eric Ark Brad Allcock 8.5890 km/sec 8.5875 km/sec 8.5859 km/sec • Grand Rocket Wizard Daniel Ruf 8.5800 km/sec 90o 4024 days Portfolios • Mid-Course Thoughts – The “Prime Directive” is to demonstrate your Mastery of course material • Not a research paper • Not a literary masterpiece - use your page for substance, not fluff – Evaluation of each Document • Demonstration of Connection • Demonstration of Mastery • Composition/Writing 2 pts 5 pts 3 pts – Encourage you to turn in at least your first one early to get feedback to improve the rest. Telescopes • Fundamental Purpose - To Collect Light Light from a Star Faint Bright Brightest ConcepTest! In bright light your pupil has a diameter of 1 mm; in a dark room your pupil opens to 5 mm. If you walk into bright sunlight after your eye doctor has dilated your pupils, your eyes will ache. This is because A) of the chemicals the doctor used to dilate your pupils. B) your pupils are letting in 5x as much light as your retina is comfortable with. C) your pupils are letting in 25x as much light as your retina is comfortable with. D) your pupils are letting in 1/5 x as much light as your retina is comfortable with. E) your pupils are letting in 1/25 x as much light as your retina is comfortable with. Telescopes • Fundamental Purpose - To Collect Light 1 cm Collecting Area = p R2 = p * 1 cm2 5 cm 10 cm Collecting Area = p R2 = p * 25 cm2 Collecting Area = p R2 = p * 100 cm2 Telescopes •Beyond Visible Light Telescopes •Telescopes in Space Compton Gamma-Ray Observatory Spitzer •Telescopes in Space Infrared Telescopes Optical Crab Nebula X-ray Optical The Solar System! The Solar System • A Sense of Scale Around Earth Around Europe 0.1 Distance to Moon Distance to North America