We Only See The Past

The video explains how sound and light travel at different speeds, causing delays in perception. It uses examples like a hammer hitting a pole and lightning to illustrate sound travel. The moon's distance is discussed, showing how light takes time to reach Earth, making us see the moon as it was 1.3 seconds ago. The video also covers galaxies seen by the James Webb Space Telescope, which are billions of light years away, meaning we see them as they were billions of years ago. Finally, it highlights that everything we see is in the past, even objects close to us, due to the time light takes to travel.

What is the approximate speed of sound through air at a given temperature?

Explain why we see lightning before we hear thunder.

How long does it take for light from the moon to reach the Earth?

What does it mean when we say we are looking at the past when observing celestial objects?

What is the significance of the distance of galaxies in relation to the time it takes for their light to reach us?