The Amazing Universe: Distances in Space

The video explains how distances are measured on Earth using kilometers or miles and introduces the concept of measuring distances in space. For nearby objects like the Moon and Sun, kilometers are used, but for distant stars, light years are the standard unit. A light year is the distance light travels in one year, with light moving at 310,000 kilometers per second. The video also provides examples of star distances, such as Rigel being 910 light years away and Denna 1,830 light years away.

How do astronomers measure distances in space?

What is a light year and how is it defined?

What is the speed of light in kilometers per second?

How far can light travel in one year in kilometers?

What does it mean when we say the light from the star Denna is 1,830 years old?