Here's the breakdown:
* Light travels incredibly fast: It moves at approximately 299,792,458 meters per second (approximately 186,282 miles per second).
* A year is a long time: There are 365.25 days in a year.
* Light-years are a measure of distance: Since light travels so quickly, it's useful to measure vast distances in space using the distance light travels in a year.
Important Notes:
* Light-years are not a measure of time: They measure distance, not time.
* They are very large: One light-year is equivalent to about 9.46 trillion kilometers (5.88 trillion miles).
Example:
If a star is 10 light-years away, it means the light we see from that star today left the star 10 years ago.
