1/25/2017 1 Astronomy 4800 – Space Science: Practice & Policy ASTR 4800 - Space Science: Practice & Policy Today: Introduction to Outer Space • Next Class: Visit with ISS astronaut Dr. Sandra Magus. Read bio at: https://www.aiaa.org/SandyMagnusBio /. • Reading for next Monday: Chapters 2-5 in McDougall. • Homework #1 – due on Friday, Feb. 3. Astronomy 4800 – Space Science: Practice & Policy Space in the News: NASA Selects Two Missions to Explore the Early Solar System (Left): An artist’s conception of the Lucy spacecraft flying by the Trojan Eurybates – one of the six diverse and scientifically important Trojans to be studied. Trojans are fossils of planet formation and so will supply important clues to the earliest history of the solar system. (Right): Psyche, the first mission to the metal world 16 Psyche will map features, structure, composition, and magnetic field, and examine a landscape unlike anything explored before. Presenter: Chris Davidoff Astronomy 4800 – Space Science: Practice & Policy Introduction to Outer Space Explanatory Statement Prepared by President Eisenhower’s Science Advisory Committee James Killian, Chair & President’s Science Advisor March 26, 1958 Astronomy 4800 – Space Science: Practice & Policy Reasons for a Space Program? • Compelling urge to explore and to discover (Edmund Hillary). • Development of space technology for defense (ICBMs, satellite spying). • National prestige (create confidence of other nations in U.S. technology). • Scientific observations and experiments enhancing knowledge of Earth, solar system, & universe. Have any of these reasons changed today? Astronomy 4800 – Space Science: Practice & Policy Reasons for a Space Program Today? • Evidence for extraterrestrial life • Survival – time limited on Earth • Gather resources • Exploration – part of being human • To find out about our origins – water • National defense • Economics • Creating high paying technical • Communications across the planet. Astronomy 4800 – Space Science: Practice & Policy The physical principles governing spaceflight: Newton’s three laws of motion Newton’s first law of motion: An object moves at constant velocity unless a net force acts to change its speed or direction.