Shells of Cosmic Time (ft. @AstroKatie)

The video explores how we perceive objects in the past due to the time light takes to reach us. It discusses viewing celestial bodies like the sun, Alpha Centauri, and Andromeda galaxy as they were in the past. With telescopes, we can see galaxies from over 13 billion years ago, witnessing the universe's early stages. The most distant parts of the cosmos reveal the final stages of the Big Bang, filled with plasma. We are at the center of our perception, surrounded by layers of cosmic time, with the cosmic microwave background as the most distant layer.

Why do we see objects in the past when we look at them?

• Because light takes time to travel from the object to us.

• Because our eyes have a delay in processing images.

• Because the universe is expanding.

• Because objects emit light at different speeds.

How long ago do we see the sun when we look at it?

• 13 billion years ago

• 2.5 million years ago

• 8 minutes ago

• 4.4 years ago

What can powerful telescopes reveal about the universe?

• They can show us the future of the universe.

• They can reveal galaxies from over 13 billion years ago.

• They can detect sound waves from distant stars.

• They can measure the temperature of the universe.

What is the cosmic microwave background?

• The light from the sun that reaches Earth.

• The light from the early universe after the Big Bang.

• The heat emitted by stars in the galaxy.

• The sound of the universe expanding.

What marks the most distant layer of time we can observe?

• The birth of the sun.

• The formation of the first stars.

• The cooling of the primordial fire.

• The creation of the Milky Way.