Exploring the Past: The Fascinating Concept of Light Years

The video explains how telescopes allow us to see objects light years away, effectively letting us look into the past. It describes how humans perceive light and how the speed of light affects our perception of distant objects. The concept of a light year is introduced as a measure of distance, illustrating how light from distant galaxies, like Andromeda, takes millions of years to reach us, showing us the galaxy as it was in the past.

What is the distance of the Andromeda galaxy from Earth in light years?

Discuss the implications of observing the Andromeda galaxy as it was 2.5 million years ago.