ISP 205: Visions of the Universe - Physics & Astronomy
ISP 205: Visions of the Universe - Physics & Astronomy
ISP 205: Visions of the Universe - Physics & Astronomy
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What have we learned?• How can we know what <strong>the</strong> universe was like in<strong>the</strong> past?• Light takes time to travel through space (<strong>the</strong> speed<strong>of</strong> light = c = 300,000 km/s). Thus, when we lookfar<strong>the</strong>r away, we see light that has taken a longertime to reach us.• Can we see <strong>the</strong> entire universe?• No - age limits <strong>the</strong> size <strong>of</strong> <strong>the</strong> observable universe.For a 14 billion year old universe, our observableuniverse is 14 billion light-years in radius.© 2005 Pearson Education Inc.,publishing as Addison-Wesley
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