# Assuming the size of the Earth is 1cm, what size is the largest star in the universe?

If the Earth were just a marble, the Sun would be the size of a yoga ball, and the largest star in the universe has a diameter that’s hard to believe.

We all know that the Earth is simply a grain of sand compared to the universe, but very few people can imagine how great the distances between celestial bodies are.

Assuming that the diameter of the Earth is 1 cm which is equivalent to the size of a marble. The diameter of the Moon is 0.27 cm. The dimensions of Mercury, Mars, Venus, Uranus, Neptune, Saturn and Jupiter will be 9.5 px, 13.25px, 22.5px, 100px, 95px, 235px, 275px ( 1 px = 0.026458333 cm), where Saturn and Jupiter are about the size of a tennis ball.

The largest star in the observable universe is UY Scuti.

As the largest star in the Solar System, the Sun is 2750px in diameter, roughly the size of a large yoga ball. You can imagine how big the distance between the marble and the yoga ball is.

However, in the entire universe, the Sun is only a small star among countless stars. Today, the largest star in the observable universe is UY Scuti, a red supergiant star in the constellation Scutum with a diameter of 2.4 billion km, 1700 times the diameter of the Sun. Even the speed of light going from one end to the other takes 133 minutes.

Of course, UY Scuti is not a big planet in the universe, we all know that the largest object in the universe is a black hole. The black hole numbered SDSS J140821.67 + 025733.2 has a mass 196 billion times that of the Sun. If the diameter of the Earth is 1 cm and the diameter of the Sun is 1 meter, then the diameter of the black hole is 920 km.

We only know that the diameter of the Milky Way is about 100,000 light years or 200 million km and a thickness of 12 million km. This length is equivalent to the distance from the Earth to the Sun. Therefore, if the Earth takes a year to orbit the Sun, and the ellipse formed is equivalent to the Milky Way.

Compared to the largest stars in the universe and the Milky Way, our Earth is too small, but it has all the necessary ingredients to create the existence of humanity.