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Feb 2006
47m 56s

Lecture 32: Space, Time, & Gravity: Gene...

Richard Pogge
About this episode
What is gravity? Newton left that question unanswered when he formulated his inverse square law of the gravitational force, framing no hypothesis for what agency transmits gravity, only asserting it was an action at a distance. Einstein brought gravity into relativity by answering Newton's unanswered question with his General Relativity, our modern theory ... Show More
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Feb 2006
Lecture 31: A Tale of Two World Views: Special Relativity
What are space and time? To begin our exploration of the evolving Universe, we must first understand what we mean by space and time. This lecture contrasts the Newtonian view of the World, with its absolute space and absolute time, with that of Einstein, who showed that space and ... Show More
43m 3s
Feb 2006
Lecture 30: Active Galaxies & Quasars
What are Active Galaxies and Quasars? We have good reason to think that buried deep in the hearts of nearly every (?) bright galaxy is a supermassive black hole with masses of millions or even billions of times the mass of the Sun. Most, like the one in our Milky Way, are quiesce ... Show More
42m 51s
Feb 2006
Lecture 29: When Galaxies Collide
What happens if two galaxies collide? The average distance between bright galaxies is only about 20 times their size, so over the history of the Universe (14 Billion years), we expect that most bright galaxies will have had at least one close gravitational encounter with a neighb ... Show More
41m 26s
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