Looking into the past

Dinosaur lived on earth about 65 million years ago. How far you need to go to see the dinosaur?

Nothing in the universe except space-time itself can have infinite speed. What is the consequences of this simple sentence? It's really weird. Whatever you see, you see it in its past form. Sounds weird, but it is the reality. How do you see anything?- light coming from an object hits the optical sensor of your eyes and you see it. As light comes from something travelling a distance, speed is associated with this problem. Therefore it will take some time for light to come to your eyes. So you see the object "after the time" it takes to come to your eyes. Getting difficult, alright, let's take an example.

What is the time light needs to travel from sun to the earth? - It takes sunlight an average of 8 minutes and 20 seconds to reach earth from sun. That means the sun you are looking at now is actually the sun of 8 minutes and 20 seconds earlier. So you are looking into the past. If the sun disappears we will not be able to detect that instantaneously, we will detect that 8 minutes and 20 seconds later of the disappearance.

This means as far as we will look into the sky, we will see more into the past. Obviously there is an extent of this. We will never be able to look beyond the big bang. Hubble (A space telescope) can look almost 10 billion years into the past. If we have a "very good" telescope, may be we will be able to see the birth of the first generation stars.

Hubble Space Telescope. Credit: NASA