Word of the Week

light year

lite - yeer
the distance light travels in a year, a common unit of measurement in space





In Context

The sun is 8 light minutes away from Earth, meaning it takes light 8 minutes to travel from the sun to Earth. The next closest star is 4 light years away, meaning it takes light 4 years to travel from the star to Earth. The new James Webb Space Telescope will be able to see farther than ever before and because of how light travels, it will be able to see 13.8 billion years into the past.


Fun Fact: Light travels at 186,000 miles per second.