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Horizons

Horizons. Michael A. Seeds. PowerPoint Presentations by Markus B ö ttcher. Brooks/Cole – Thomson Learning 9 th Edition. Chapter 1: The Scale of the Cosmos. Astronomy deals with objects on a vast range of size scales and time scales.

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Horizons

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  1. Horizons Michael A. Seeds PowerPoint Presentations by Markus Böttcher Brooks/Cole – Thomson Learning 9th Edition

  2. Chapter 1:The Scale of the Cosmos • Astronomy deals with objects on a vast range of size scales and time scales. • Most of these size and time scales are way beyond our every-day experience. • Humans, the Earth, and even the solar system are tiny and unimportant on cosmic scales.

  3. A Campus Scene 16 x 16 m

  4. A City View 1 mile x 1 mile

  5. The Landscape of Pennsylvania 100 miles x 100 miles

  6. Earth Diameter of the Earth: 12,756 km

  7. Earth and Moon Distance Earth – Moon: 384,000 km

  8. Earth orbiting around the Sun Distance Sun – Earth = 150,000,000 km

  9. Earth orbiting around the Sun In order to avoid large numbers beyond our imagination, we introduce new units: 1 Astronomical Unit (AU) = Distance Sun – Earth = 150 million km

  10. The Solar System Approx. 100 AU

  11. (Almost) Empty Space Around our Solar System Approx. 10,000 AU

  12. The Solar Neighborhood Approx. 17 light years

  13. The Solar Neighborhood New distance scale: 1 light year (ly) = Distance traveled by light in 1 year = 63,000 AU = 1013 km = 10,000,000,000,000 km (= 1 + 13 zeros) = 10 trillion km Nearest star to the Sun: Proxima Centauri, at a distance of 4.2 light years Approx. 17 light years

  14. The Extended Solar Neighborhood Approx. 1,700 light years

  15. The Milky Way Galaxy Diameter of the Milky Way: ~ 75,000 ly

  16. The Local Group of Galaxies Distance to the nearest large galaxies: several million light years

  17. The Universe on Very Large Scales Clusters of galaxies are grouped into superclusters. Superclusters form filaments and walls around voids.

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