Waching daily Nov 5 2017

How can astrophysicists study the story of the universe

Billions of years ago when the Big Bang happened there was no Milky Way galaxy no solar system

No planet Earth and especially no human beings to witness these and all the events that followed

So how would they know about this stuff?

Well it turns out that the universe is somehow like a time machine when looking at things in the sky

We are looking at that past

Yeah, it's a bit confusing, but try it this way when you hear a plane

You probably have a hard time spotting it in the sky

You look in the direction where the sound came from but the plane is no longer there

That's because it's sound took some time to reach you and by the time

It did the plane had already moved on

In a way you were hearing back in time as the sound he perceived was the one that left the plane seconds before

With light it's exactly the same

Even though light is much faster than sound in fact. It's the fastest thing

We know it still takes time to get from where it is emitted to where it is seen

The father the object the longer it takes light to make the journey to the observer by looking at galaxies that are very far away

Whose light takes billions and billions of years to reach us?

We are seeing them how they looked billions of years ago when the universe was much younger and they were just beginning to form

But as we look at galaxies that are closer and closer to us studying them throughout time

It's possible to see how they aged and change just like if we were looking at babies children

Teenagers and adults to see how humans develop

The problem is when things are very far away from you it gets to a point where it's impossible for your eyes to distinguish details

telescopes especially the ones that see the same kind of light as we do also have a limit and are not able to detect the

Light emitted by the first galaxies have informed as they are too distant and their light is too faint in those galaxies

However the first stars were born and even though

there's no telescope powerful enough to see them shine Aylmer with its incredible sharpness and ability to see radio light can distinguish the dust and

Gas clouds, which formed the first generations of stars in the universe

This can help astronomers know a little bit more about these early phases of time space which are fundamental to understand our present

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