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.

How do telescopes allow us to see into the past?

• By slowing down time

• By reflecting light from the future

• By capturing light that has traveled for years

• By speeding up the light

What is the speed of light in kilometers per second?

• 150,000 km/s

• 600,000 km/s

• 450,000 km/s

• 300,000 km/s

How long does it take for sunlight to reach Earth?

• Approximately 1 hour

• Approximately 30 minutes

• Approximately 15 minutes

• Approximately 8 minutes

What does a light year measure?

• The age of a galaxy

• The brightness of a star

• The distance light travels in a year

• The time light takes to travel in a year

How far is the Andromeda galaxy from Earth?

• 4.5 million light years

• 2.5 million light years

• 1.5 million light years

• 3.5 million light years