How Big Is the Sun?

Our Sun is 864,000 miles in diameter and 10,000 degrees Fahrenheit on the surface. Our Sun is a bright, hot ball of hydrogen and helium at the center of our solar system. It is 864,000 miles (1,392,000 km) in diameter, which makes it 109 times wider than Earth.

The sun is a nearly perfect sphere. Its equatorial diameter and polar diameter differ by only 10 km. The Sun’s mean radius is 432,450 miles (696,000 kilometers), giving it a diameter of about 864,938 miles (1.392 million km). According to NASA, you could line up 109 Earths in front of the Sun. The circumference of the sun is about 2,715,396 miles (4,370,006 km).

It may be the largest around, but the sun is only average compared to other stars. Betelgeuse, a red giant, is about 700 times larger than the Sun and about 14,000 times brighter.

So, how big is the Sun? More than one million Earths could fit inside the Sun if it were hollow. The total volume of the sun is 1.4 x 1027 cubic meters. The mass of the Sun is 1,989 x 1030 kilograms, about 333,000 times the mass of Earth. The Sun contains 99.8 percent of the mass of the entire Solar System, leading astronomers Imke de Pater and Jack J. Lissauer, authors of the textbook Planetary Sciences, to refer to the Solar System as “the Sun plus debris”.

How large is the Sun compared to Earth?

Compared to Earth, the Sun is enormous! It contains 99.86% of all of the mass of the entire Solar System. The Sun is 864,400 miles (1,391,000 kilometers) across. This is about 109 times the diameter of Earth. The Sun weighs about 333,000 times as much as Earth. It is so large that about 1,300,000 planet Earths can fit inside of it. Earth is about the size of an average sunspot!

What is bigger than the sun?

The sun may seem impossibly large, but there are billions of things in the universe that are larger than our sun. Consider it; Our Sun is considered a medium-sized star at best.

There are huge stars out there that are hundreds to thousands of times larger than our sun. These stars are known as giant stars, supergiant stars, or hypergiant stars.

Let’s take a look at one of the most famous giant stars, VY Canis Majoris. VY Canis Majoris has between 1,300 and 1,540 solar radii, meaning its radius is at least 1,300 times that of our Sun.

Another star, KY Cygni, is 1,420 to 2,850 times the radius of our Sun. UY Scuti has 755 solar radii, WHO G64 has between 1,504 and 1,730 times the radius of the Sun.

Mu Cephei is about 1,650 times the radius of the Sun, while RW Cephei is 1,535 times the radius of the Sun. Westerlund 1-26 is 1,530 to 2,550 times the solar radius, while V 354 Cephei is 1,520 times the solar radius.

As you can see, there are plenty of stars which are several times bigger than our Sun out there. It’s just a matter of time until we will reclassify our Sun as being below average- in terms of size.

How Does Our Sun Compare With Other Stars?

Our Sun is an intermediate-sized star: there are smaller stars and larger stars, even up to 100 times larger. Many other solar systems have multiple suns, while ours has only one. Our sun is 864,000 miles across and has a surface temperature of 10,000 degrees Fahrenheit.

Our sun is a bright, hot sphere of hydrogen and helium at the center of our solar system. It is 1,392,000 km (864,000 miles) in diameter, making it 109 times wider than Earth. It’s 10,000 degrees Fahrenheit (5,500 degrees Celsius) on the surface and 27 million degrees Fahrenheit (15,000,000 degrees Celsius) at the core. Oops!

Our sun is pretty impressive, but how does it compare to other stars? There are billions of other stars in the Milky Way – the galaxy we call home. And there are many, many more in the rest of the universe. Is our sun something special?

The size of the Sun compared to the planets of the solar system

To fully understand the scale of our sun, let’s compare its size to each planet of our solar system.

  • Mercury: The Sun is 277 times larger than Mercury. 21 million Mercury-sized planets could fit inside the Sun.
  • Venus: The Sun is 115 times larger than Venus. 1.5 million Venus-sized planets could fit inside the Sun.
  • Earth: The Sun is 109 times larger than Earth. 1.3 million Earth-sized planets could fit inside the Sun.
  • Mars: The Sun is 207 times larger than Mars. 7 million Mars-sized planets could fit inside the Sun.
  • Jupiter: The Sun is 11 times larger than Jupiter. 1,000 Jupiter-sized planets could fit inside the Sun.
  • Saturn: The Sun is 12 times larger than Saturn. 1,600 Saturn-sized planets could fit inside the Sun.
  • Neptune: The Sun is 27.7 times larger than Neptune. 21,000 Neptune-sized planets could fit inside the Sun.
  • Uranus: The Sun is 27.4 times larger than Uranus. 22,000 Uranus-sized planets could fit inside the Sun.
  • Bonus: Pluto: The Sun is 585 times larger than Pluto. 200 million Pluto-sized dwarf planets could fit inside the Sun.


  1. Wikipedia
  2. NASA 
  3. Space
  4. Theplanets