Understanding Cosmic Time and Light Travel

The video explores how light travel affects our perception of time, illustrating that everything we see is in the past. It explains how telescopes allow us to observe galaxies from billions of years ago, revealing the universe's history. The video describes cosmic time layers, with the cosmic microwave background as the most distant observable layer. It concludes with credits and information about the sponsor, Brilliant.org, which offers courses on measuring cosmic distances.

How far back in time do we see the Sun when we look at it?

• 8 days ago

• 8 seconds ago

• 8 minutes ago

• 8 hours ago

What is the approximate time it takes for light from Alpha Centauri to reach us?

• 4.4 years

• 4.4 seconds

• 4.4 hours

• 4.4 minutes

How long has the light from some galaxies been traveling to reach us?

• 13 billion years

• 1 billion years

• 5 billion years

• 10 billion years

What do we observe when we look at the most distant parts of the cosmos?

• The formation of new stars

• The creation of black holes

• The final stages of the Big Bang

• The collapse of galaxies

What is the universe filled with in its earliest observable state?

• Interstellar gas

• Cosmic dust

• Dense plasma

• Dark matter

What concept describes our perception of different eras of the universe?

• Cosmic layers

• Time dilation

• Space-time continuum

• Nesting-doll layers

What surrounds us at every edge of our vision according to the video?

• Dark energy

• Cosmic microwave background

• Galactic clusters

• Intergalactic voids

What is the final layer of cosmic time described in the video?

• Earth

• Fire

• Water

• Ice

What educational platform is mentioned as the sponsor of the video?

• edX

• Coursera

• Khan Academy

• Brilliant.org

What type of course does Brilliant.org offer related to the video's topic?

• Quantum mechanics

• Biology

• Trigonometric parallax

• Astrophysics