布赖恩·斯威姆导论

Loading...

Del curso dictado por Yale University

宇宙之旅：对话 (Journey of the Universe: Weaving Knowledge and Action)

1 calificación

Yale University

宇宙之旅：对话 (Journey of the Universe: Weaving Knowledge and Action)

1 calificación

宇宙之旅是由不断进步的科学发现和人文科学交织组成的，历史、哲学、艺术、宗教统统都含括在内。这门课由一系列20个与科学家与环境学家关于宇宙之旅的访谈组成。前10个访谈是与科学家和历史学家的访谈，它们帮助我们深化对宇宙、地球、人类进化过程的理解。后10个访问是与环境学家、教师和艺术家的访谈，它们探索了宇宙奥义和人类社会之间的联系。

De la lección

导论 –宇宙的历程：对话

宇宙的进化发展推动新时代替代旧时代，这也是此时此刻正在发生的。我们正从工业时代进入地球历史的一个新时代。

布赖恩·斯威姆导论3:43

Conoce a los instructores

Mary Evelyn Tucker
Senior Lecturer and Senior Research Scholar
Yale School of Forestry and Environmental Studies
John Grim
Senior Lecturer and Senior Research Scholar
Yale School of Forestry and Environmental Studies

We're exploring this new cosmology that comes out of the work of Albert Einstein

and Edwin Hubble, and other cosmologists.

In a simple way of summarizing what has

been learned is that the universe is a story.

I mean it could have just been a place, and

we tend to think of the universe as a place, but no, it's actually a story.

Meaning that the universe is a series of irreversible transformations in time.

And each of these transformations brings the universe as a whole into a new era.

Let's look at the first few to get an idea of this.

The universe begins with a very simple state.

A dark matter and baryonic matter all in the form of a plasma.

So we had neutrons and protons and electrons, and photons just

all mixed together in a plasma without a of great deal of structure.

This then, gives way to an era of atoms forming,

the atoms of hydrogen, helium, and lithium.

And then after a period of time,

this era gives way to the formation of the galaxies.

Now what needs to be emphasized in this sequence and we can go on of course.

But what needs to be emphasized in this sequence is that

each of these eras is a one time event.

By which I mean, in our current understanding,

the universe will never return to a state of plasma, not like it was at one time.

That was when that came to an end, it was over for all time.

And likewise, when the universe began to create atoms,

hydrogen and helium especially,

throughout the entire universe, that such a period will never come again.

It was a one time event.

And then when we have the appearance of the galaxies

beginning something like a billion years after the origin of the universe.

This period of galactic formation will never happen again and

even now there are no new galaxies forming.

So, you get the sense then of a story.

We're going from one era to another.

And what's interesting, the last comment on this would be

that each era actually gives rise to the next era,

in that it makes possible a new form of creativity.

So the plasma as it cooled

it opened up the potential for the formation of atoms.

So the plasma actually came to an end and enabled the atoms to come forth.

And likewise with the era of hydrogen and helium, it was the mutual

attraction between the hydrogen and helium that brought forth the galaxies.

So we have this really interesting observation that the universe

brings its eras to a close so that a new form of creativity can come forth.

And that could be true even of our time.

We might find ourselves in a transition from one era to another.

And that's actually what we'll be exploring next.

What are the first steps we might be taking into this new era in the universe?

Explora nuestro catálogo

Inscríbete de manera gratuita y obtén recomendaciones personalizadas, actualizaciones y ofertas.

Coursera brinda acceso universal a la mejor educación del mundo, al asociarse con las mejores universidades y organizaciones, para ofrecer cursos en línea.

© 2018 Coursera Inc. Todos los derechos reservados.

Descargar en la App Store

Consíguelo en Google Play