ISP 205: Visions of the Universe - Physics & Astronomy

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Big Bang: the beginning. Our telescopic measurement showthat universe is expanding → started from very hot, very dense state,14 billion years ago! Galaxy formation: on smaller scales gravity has drawnmatter together, winning over the force of expansion. Galaxies andstars were formed! Happened few billion years after Big Bang. Stars: Stars are formed from gas and dust; During their lifethey produce heavier elements starting from H and He in nuclearfusion; After they die, they explode and blow their content back intogalaxy… material gets recycled! Planets: from these heavier elements, planets (and life) wereformed.© 2005 Pearson Education Inc.,publishing as Addison-Wesley
3) How can we know what the universewas like in the past?• Light travels at a finite speed (300,000 km/s).DestinationMoonSunSiriusAndromeda GalaxyLight travel time1 second8 minutes8 years2.5 million years• Thus, we see objects as they were in the past:The farther away we look in distance,the further back we look in time.© 2005 Pearson Education Inc.,publishing as Addison-Wesley
Page 5 and 6: The Earth: our planet. Solar system
Page 7 and 8: PlanetMarsNeptuneA moderately large
Page 9 and 10: AsteroidA relatively smalland rocky
Page 11 and 12: Solar (Star) SystemA star and allth
Page 13 and 14: GalaxyA great island of stars in sp
Page 15: 2) How did we come to be?Big bang a
Page 19 and 20: Example:This photo shows the Androm
Page 21 and 22: Question: Why can’t we see a gala
Page 23 and 24: What have we learned?• How did we
Page 25 and 26: 1.2 The Scale of the UniverseOur go
Page 27 and 28: Let’s reduce the size of the sola
Page 29 and 30: How far away are the stars?On our 1
Page 31 and 32: How big is the Milky Way Galaxy?The
Page 33 and 34: Suppose you tried to count the more
Page 35 and 36: • Now let’s step through the Un
Page 37 and 38: January 1st: Big Bang.February: Mil
Page 39 and 40: What have we learned?• How big is
Page 41 and 42: How is Earth moving in our solar sy
Page 43 and 44: Our Sun moves randomly relative to
Page 45 and 46: Within the Local Group galaxies mov
Page 47 and 48: Are we ever sitting still?Question:
Page 49 and 50: What have we learned?© 2005 Pearso
Page 51: What have we learned?• Are we eve

ISP 205: Visions of the Universe - Physics & Astronomy

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