‘Light year’ is commonly used to measure distance in space. It is not easy to measure the distance of stars, planets or galaxies present in the universe, hence a standard has been created by which it can be easily measured. But do you know the meaning of ‘Prakashvarsh’? Why is this term used only? What other standards do astronomers use to measure distances in space? The same question was asked on the online platform Quora. Let us know the true meaning of the word ‘Prakashvarsh’.
There are innumerable stars present in the universe, but they are not at equal distances. Most of the stars form a group, which we call a galaxy. The distance between them is so great that we cannot measure it in kilometers or miles. To measure these, ‘light year’, parsec is used. Now what is called a light year? So in simple words, understand it like this that the distance covered by light in one year is called ‘light year’.
what is the speed of light
Light travels at a speed of 3 lakh kilometers per second. In this way, it travels 11160000 kilometers in one minute, whereas in one year it covers a distance of 9.46 trillion kilometers. If someone travels at the speed of light, he can circle the Earth’s equator 7.5 times in one second. Another thing is that the distance is longer than a parsec light year. One parsec is equal to 3.26 parsecs. It is believed that there are probably 400 billion stars in our Milky Way Galaxy. And their extension is approximately equal to one lakh light years.
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FIRST PUBLISHED: November 2, 2023, 21:01 IST