The sky is actually like a giant mirror. When we look up, we don’t just see the stars We are looking billions of years ago.

let’s see how many light years are we looking for?

Let’s delve a little deeper into the speed of light and distances in the universe.

Speed ​​of light, approximately per second 300 thousand kilometers expresses. While this is a beautiful number, it is of course a bit modest when it comes to the size of the universe.

For example Light coming from the sun to the earthtravels in about 8 minutes. So when we look at the sun, we actually see it as it was eight minutes ago.

This doesn’t just apply to the sun either. Distant stars, galaxies and we can even say the same for all objects deep in the sky.

Many of the stars we see in the sky are quite far from Earth.

The distance a light year travels in 1 year about 9.5 trillion km. Take Sirius. It is about 8.6 light years away from us. So we actually see it as it was 8.6 light years ago.

There’s something even more impressive. Room Andromeda Galaxy. It is 2.5 million light years away.

We can’t do without mentioning the HD1 galaxy.

The most remote object humans have ever seen It is located approximately 13.3 billion light years away. It is estimated to have formed shortly after the Big Bang, when chemical elements were virtually nonexistent. This means that we observe it as it existed in the very early universe.

However, when we look at HD1, we can’t say we see it because space telescope It was detected with . But while we’re on the subject: information is information.

In astronomy, this concept is called “cosmic time machine”.

In fact, each celestial body represents a different time period of the universe depending on its distance. Hubble Space Telescope Thanks to observations made with instruments such as: we can reach the state of the universe billions of years ago.

Immediately after the formation of the universe With these observations, which means witnesses, we actually see the traces of many things and add new ones to our knowledge of space.

What if some stars are dead?

Maybe some of those bright stars we see in the sky are already there destroyed by a supernova explosion and we still see the former light.

The next time you look at the sky history book of the universe You may now feel like you are reading in light of this information.

You can also check these: