A light year is a unit of distance.
It is defined as the distance that light travels in one year.
In our daily lives, we typically use units such as centimeters, meters, kilometers, miles, inches, and feet to measure distances between two points. However, these units are not suitable for measuring the vast distances between astronomical objects like planets, stars, and galaxies. Therefore, astronomers use the light year as a more appropriate measurement.
1 Light Year = 9.4607×1012 km
•Light travels at the rate of 3×108 m/sec in vacuum.
•Light travels at the rate of 2.2×108 m/sec in water.
•Light travels at the rate of 2×108 m/sec in glass.
DO YOU KNOW?
•Milky Way galaxy is about 1,000,000,000,000,000,000 km (about 100,000 light years).
There are billions of galaxy in the observable universe.
•Nearest galaxy to our Milky Way galaxy is Andromeda Galaxy which is 2.3 million light years away.
Just imagine how long the distance is and how big our universe.
•The radius of observable universe is 46.508 billion light years.
Think how our science has developed that we can study the planets,stars,galaxies up to this huge distance.
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