So, I organized this content in four lectures,

as I said already.

And it will be extremely helpful if you

know some calculus but I also organized the content

in such a way that if you want to skip some of the equations, you can do so.

And still you can probably get some

conceptual understanding of what's going on there.

But if you do know Calculus, then you can follow

some of the equations and get a deeper understanding that way.

And the homework will also be organized in a way

that you have some conceptual problems, which you can understand without

the need of Calculus.

And some other more advanced problems where you really need

to do some math and, and algebra to work things out.

So, hopefully this kind of combination would reach you in,

in a, to a much, much wider audience that way.

So, many of you who may not have that kind of

background you can still get something out of my lectures, hopefully.

And if you do, you can get a lot more that way.

Okay?

So, that's the way we'd like to get started.

As I said,

From the Big Bang to Dark Energy.

The kind of questions we would like to ask in these lectures are

really, sort of, questions you might have had when you were a little child.

So, if you go to, let's say, vacation and

camping, you watch up the star in the starry

sky in the evenings and, of course, one of the sense we always get is kind of awe.

We always feel that the universe is so beautiful, stars

are so beautiful, we'd like to at least understand what's

going on there.

And you tend to get into really

philosophical thoughts just by looking at the stars.

And this is kind of questions you might have asked when you were little.

How does the universe began? So, this is such a big universe out there?

But, you know, we hear that this

was actually the beginning, that's the big bang.

So, what exactly was the big bang?

How did the universe begin?