TTC – My Favourite Universe [13 Avi]
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In My Favorite Universe, the astrophysicist who directs the nation’s most famous planetarium takes you on a spirited and intellectually engaging journeythrough the cosmos and all its history, from before the Big Bang to the most likely ways in which Earth, and perhaps the entire universe, might end.
My Favorite Universe +++++++++++++ Course No. 158
Neil deGrasse Tyson Ph.D.
Hayden Planetarium
About This Course
12 lectures | 32 minutes per lecture
Clear Science Teaching to Set the Stage for an Awe-Inspiring Course
Created for a lay audience and readily accessible, in this course science always takes precedence over
drama. The lectures are certainly entertaining, often funny, even awe-inspiring at times, as
befits the subject matter.
Even though you will be entertained, you will be learning good science.
Clear introductions to essential principles of physics support these lectures, including density, quantum theory,
gravity, and the General Theory of Relativity. Professor Neil deGrasse Tyson also includes forays into
disciplines such as chemistry and biology as needed to explain events in astronomy.
For example, Dr. Tyson begins one lecture at a point 13 billion years ago, when all space, matter, and energy in
the known universe were contained in a volume less than one-trillionth the size of a pinpoint-about the size of a
single atom. By the time he finishes, the cosmos has been stretched, the planets and our Earth formed, and 70
percent of existing Earth species have been wiped out by a gigantic asteroidclearing the way for the evolution of
humanity.
Along the way he has touched on Einstein’s famous equation, E=mc2; on the four forces that were once unified in
the early cosmos in a way physicists are still trying to explain; and on the chemical enrichment of the universe
by exploding supernovae, which give the universe its necessary supply of heavier elements including oxygen,
nitrogen, iron and, most important, carbon.
Carbon, we learn, is a “sticky” atom, capable of making more kinds of molecules than all other elements combined.
It’s the ideal element with which to experiment in the building of life forms and is, of course, the element
responsible for the remarkable diversity of life, including us.
As Dr. Tyson notes, we are made of stardust, just as the planets are. And he has created a course that explains
exactly how that came to be, beginning with a grounding in the basic “machinery” of matter, forces, and energy
that has been discovered on Earth and which also reveals itself throughout the universe.
The Stark and Violent Beauty of the Universe
With this basic foundation in place, explanations of cosmic events fall logically into place, and the realities
of the universe-including its eventual demise-are revealed in stark and often violent beauty. You learn:
•how Saturn’s rings were formed, and why they will eventually be lost
•why low-density conditions are necessary to produce the drama of the northern and southern auroras
•why even the most jagged and wild of the Earth’s mountain ranges are, from a cosmic standpoint, really part of a
perfectly smooth sphere
•how black holes are formed and the extraordinary way in which they can wreak havoc in the universe
•how asteroids moving through space represent threats of extraordinary consequence to Earth, no matter how long
those threats may take to be realized
•why the seemingly infinite panorama of celestial bodies revealed by the Hubble Space Telescope’s famous “Deep
Field” so intrigued astronomers
•how astronomers actually look for new planets,
•why the odds seem overwhelmingly in favor of some kind of life out there, whether we ever make contact or not.
Most important, none of these ideas are presented as isolated “space factoids” that serve no purpose but to
entertain. They are there to illustrate and reinforce the key principles of physics and astrophysics that are
continually being presented in this course.
But the inclusion of real science doesn’t prevent Dr. Tyson from having some fun, either.
When it’s time to show how a black hole might remove one from the universe, he leads you right up to the “event
horizon” and slips you in-feet first. Since the event horizon represents the point within which nothing, not even
light, can escape, you might think this is a bad idea. And you would be right.
But as you plummet toward the “singularity” at the heart of the black hole, you will learn firsthand about the
interesting effects of gravity truly unleashed, including what physicists refer to, with a straight face, as
“spaghettification.” (Actually, Professor Tyson recommends that you be sucked in to a large black hole rather
than a small one. You’ll still be spaghettified, but it won’t happen as quickly.)
But make no mistake: Dr. Tyson does not consider the cosmos a laughing matter, this kind of whimsical touch
notwithstanding. In spite of his training, he remains, admittedly, still in awe of his subject. And he has
created a course that might well produce the same feeling in you.
12 Lectures
1 On Being Round
What forces tend to make objects round? And why is a sphere the most efficient shape an object can take? The
answers will lead us across the cosmos
2 On Being Rarefied
Just how “thin”-low in density-is the “thin air” out of which a magician produces a rabbit? And if the universe
contains components that are even thinner, exactly what does that mean to us?
3 On Being Dense
This is a discussion of different levels of density and the inherent mysteries of this property, along with the
ways in which an understanding of density helps us think creatively about the world.
4 Death by Black Hole
Take a look at black holes, one of the most fascinating topics in the universe-including the ways in which they
would kill a human being, how they wreak havoc in the universe, and some provocative new research.
5 Ends of the World
Here is a detailed look at three scenarios for the destruction of our planet: the death of the Sun, the collision
of the Milky Way and Andromeda galaxies, and the heat death of the cosmos.
6 Coming Attractions
We now know that a deposit of energy sufficient to kill off 50 to 90 percent of all species strikes Earth every
100 million years. This lecture looks at our risks of getting hit by an asteroid and what we can do to avoid it.
7 Onward to the Edge
Take a break from the death and destruction of asteroids and the end of the universe and wonder, instead, at the
enormity of the cosmos and what our place in it might be.
8 In Defense of the Big Bang
We now know without doubt how the universe began, how it evolved, and how it will end. This lecture explains and
defends a “theory” far too often misunderstood.
9 The Greatest Story Ever Told
A synthesis of the greatest discoveries of physics, astrophysics, chemistry, and biology creates a coherent story
of the birth and evolution of the cosmos.
10 Forged in the Stars
The origin of the elements that make up life is one of the most important discoveries in any field in the 20th
century, yet underappreciated by the public because it happened over many decades. This lecture presents a step-
by-step explanation of the long path to a Nobel Prize-winning idea.
11 The Search for Planets
Before 1995, the planets of our own solar system were the only ones we knew about; the total has now passed 100.
This lecture discusses the tools and methods being used to find other planets that might be hospitable to human
life.
12 The Search for Life in the Universe
This lecture examines the very real possibility that life exists elsewhere, and speculates about its origins and
chemical makeup.
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