Who is more: the stars of the universe or the sea sand of the earth? The figure will surprise you


Carl Sagan, a famous astronomer, once said that there are more stars in our universe than there is sand on the beaches on Earth. But can we find out whether he was right or wrong? We can try, right?

First, let us understand about stars and galaxies. Our galaxy is made up of hundreds of billions of stars. It is a bit difficult to find out the exact number of stars in it, because some are visible to us but some are covered with opaque dust. But we can estimate that there may be 200 billion stars in it.

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How many stars are there in the universe now?

To find out how many stars there are in the universe, you just need to multiply the number by the total number of galaxies. In 2016, a team of astronomers reported that there are about two trillion galaxies in the universe. So the total estimated number of stars is 10 million x 2 trillion = 20 million trillion = 20 quintillion, or 2 x 1019 Maybe, but how does it compare to sand?

Now let’s find out about sand
Before finding out about the sand on all the beaches of the world, we have to find out the number of beaches. The total length of the coastline on earth is about 2.5 million kilometers. Out of this, 7 lakh 50 thousand kilometers or 750 million meters is sandy beach. Now how much sand can be there in one cubic meter? The size of sand particles ranges from less than 0.1 millimeters to about 2 mm. Let’s calculate it by assuming an average of 1 mm. So there will be 1,000 x 1,000 x 1,000 = 1 billion sand in one cubic meter. The total number of stars is 20 million trillion.

the total amount of sand on earth
To find the total amount of sand, 50 meters wide x 10 meters deep x 750 million meters long (the length of sandy beaches on Earth) = 375 billion cubic meters. If we go with one billion grains of sand per cubic meter, that means there are 375 billion x 1 billion = 375 quintillion grains of sand on Earth. Let’s round it up to 400 quintillion. So the total amount of sand on Earth is 4 x 1020 There are grains of sand, about 20 times more than the number of stars that exist in the universe.

Is the calculation absolutely correct?
It is not possible, we can only guess, because our brain has not evolved to deal with such large numbers, so mistakes are possible, but this is how it works in maths and science, isn’t it? Predictably

Tags: Scientific facts, Science news

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