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Masses of objects from t 326 Light years 3085x1013 km Light Year ly The light year ly is an alternative unit of distance. and Light-based Technologies. 2015. Communications. Health. Economy. Environment . Social. Argentina, Australia, Azerbaijan, Bosnia and Herzegovina, Chile, China, Colombia, Cuba, Dominican Republic, Ecuador, France, Ghana, Guinea, Haiti, Honduras, Israel, Italy, Japan, Mauritius, Mexico, Montenegro, Morocco, Nepal, New Zealand, Nicaragua, Palau, Republic of Korea, Russian Federation, Somalia, Spain, Sri Lanka, Tunisia, Turkey, Ukraine and United States of America. Recap. Canvas homework due Wednesday. Lab this week: Parallax. Overview of the Universe. Solar System, Galaxy, Universe. Largest scales. Expanding Universe. Evidence for a Big Bang. Evidence for an accelerating Universe . Recap. Distances in astronomy. Measuring distances directly with light travel time. Measuring distances geometrically with parallax. Measuring distances using . brightnesses. Distances using brightnesses. Key Ideas. Distance is the most important & most difficult quantity to measure in Astronomy. Method of Trigonometric Parallaxes. Direct geometric method of finding distances. Units of Cosmic Distance:. Science 9. Using scientific notation. Distances in space are very large. We use scientific notation to represent very large and very small numbers. The first digit is between 1 and 9. This is called the base. AMA Stats Day – November 2016. Sarah Howell (. Kaihautū. M. ātauranga – Pāngarau). AND. Michelle freeman(Senior Teacher). The purpose of the unit . How far until it stops?. To guide Year 10 students (and teachers). Spiral Nebulae: . A Huge Challenge!. The . ‘. Great Debate. ’. Curtis . vs. Shapley (. 1920). : . are the nebulae big, . even comparable . to our own Milky Way (as Curtis argued)?. or are they small satellites of the Milky Way (as Shapley maintained). Scientific Notation. Power. of 10. Decimal Equivalent. 10. 7. 10 000 000. 10. 4. 10. 000. 10. 2. 100. 10. -5. 0.00001. 10. -7. 0.0000001. Scientific Notation. This is a number in scientific notation:. Distances:. The Principle. . ‘. Real Life. ’. Distance . Determinations . We . use various . ways; . y. ou can think . of . several! For instance, you notice that a car down the road ‘looks small’,. Scientists (and the world) use the metric system. Units. Convert km to miles = multiply by .6. Convert meters to feet = 3 ft / meter.. Scale Model of Solar System. Solar System Distances. Kilometer is too small. 150,000,000 km to Sun.. An . Astronomical Unit . (AU) is defined as the average distance between the Earth and Sun. . . 1 AU = . 92 955 807 miles . or . 149 597 871 km. AU’s are used to measure distances within the solar system. . . Light Year. How far is far?. How fast is fast?. What Is It?. A light year is the . . DISTANCE that light . . will travel, through a . . vacuum, in . one . year.. Calculate Seconds. . How many seconds are in a year? . Night sky rule of thumb. :. one finger width = 2 deg. . one hand width = 10 deg.. Units for Time and Distance. Kilometer (km). = .621 miles. Light-year (. lt-yr. ). = The distance light travels in one year in a vacuum. . The Universe. Where are we?. Metric System: 1000m = 1km. Astronomical Unit (AU): Earth to sun = 1 AU (1.496 x 1011 m). ***Light Year***: Distance Light travels in ONE year! . (9.46 x 10. 12. km). Parsec: parallax-second (3.08 .