E1 Introduction to the Universe
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  • 1. IB Physics Power Points Option E Astrophysicswww.pedagogics.ca Lesson 1 Introduction to the Universe
  • 2. E.1.1 Outline the general structure of the solar system 8 planets orbiting the Sun
  • 3. Orbital path around the Sun isnot circular.
  • 4. E.1.2 Distinguish between a stellar cluster and a constellationStar clusters or star clouds are groups of stars. A globular cluster is a tight group of hundthousands of very old stars which are gravitationally bound. Stars in a cluster are relativelto each other. Omega Centauri is the most globular cluster in our Galax
  • 5. E.1.2 Distinguish between a stellar cluster and a constellationConstellations are patterns formed by prominent stars in the night sky. Although they appclose to each other, stars in constellations can vary greatly in their distance from Earth. Cassiopeia
  • 6. E.1.3 Define the light yearA unit of distance equivalent to how far light travels through space in one yearOur Sun is part of a large collection of stars called a galaxy (ours is called theMilky Way and consists of over 100 billion stars). Get used to vast distances!
  • 7. E.1.4 Compare the relative distances between the stars within agalaxy and between galaxies in terms of order of magnitude.Nearest star to our Sun – Proxima Centauri 4.2 ly away.There are only 8 stars within 101 lyDiameter ofMilky Waygalaxy is 105 ly
  • 8. Andromeda is our nearest neighborgalaxy – about 2.9 x 106 ly from theMilky Way
  • 9. E.1.5 Describe the apparent motion of the stars/constellations overperiod of a night and over a period of a year, and explain theseobservations in terms of the rotation and the revolution of the EarthDiurnal motion - the apparent circular motion of stars around the EThis observation occurs because the Earth is rotating.
  • 10. The apparent westward motion of constellation in the night sky over a period ofa year is due to the revolution of the Earth around the Sun.