Have you ever wondered if there is more sand on the earth or more stars in the universe? Today we are going to talk about this topic.
Is there more sand on Earth or more stars in the universe? 
First of all, there are about 6,974 stars visible to the naked eye in the night sky of the northern and southern hemispheres, and we all know that each star is a star, and these more than 6,000 stars are distributed in the Milky Way, within 5,000 light-years from the Earth, just a small corner of the Milky Way with a diameter of at least 1 billion light-years.
The entire galaxy has 2,000 to 400 billion stars, the observable universe is 93 billion light-years in diameter, and there are at least 2 trillion galaxies, each galaxy has 200 billion stars by a minimum standard. Then, the total number of stars in the observable universe is 2 trillion, multiplied by 200 billion, which is 4,000 trillion stars.
The vast majority of the earth's sand is distributed on the earth's crust, and according to the proportion of sand to the earth's crust of 1 1,000, the earth's crust accounts for only 042%, so the total mass of sand on the earth should be about 2,505 trillion tons, and then according to a grain of sand, the average mass is 000015 kilograms of calculations, there will be at least 1,670 trillion grains of sand on the earth.
Therefore, after comparing the two phases, it is not difficult to find that in terms of the observable universe alone, the number of stars is far greater than the sand on the earth, but the observable universe with a diameter of 93 billion light years is only a small part of the entire universe, that is, the number of galaxies and stars in the universe is unimaginable.
The universe is too big, too big to be desperately big, and for the universe as a whole, humanity is too small to mention.
Knowledge explosion training camp