Earth is the only planet in our solar system that supports life so far and has an oxygen-rich atmosphere. Sun is one of the biggest celestial bodies and the father of our Solar System. It is our central star that has 99.8% of the total mass of the Solar System. It is a yellow dwarf star about 4.5 billion years old. This hot glowing ball of hydrogen & helium lies at the center of the solar system. It is about 93-million miles away from the Earth, which is approximately a 150 million kilometers. Let us understand more about sun and how many Earths can fit in the Sun?

How many earths can fit in the Sun?
Above one million Earths can fit in the Sun if it was hollow. The radius of the Sun is about 696.340 km or 432.685 miles & has a diameter of about a 1.39 million km or 864.000 miles.
For comparison purposes, the radius of the Earth is about 2.439 km or 1.516 miles, & the diameter of about 12.742 km or 7.917 mi. The combined mass of all the planets is about 0.2 percent of the total mass of the Sun. It is about 109-times Earth's diameter. Now, you can imagine how massive the Sun is.
Sun is equals to the heart of the solar system, where it's the biggest object so far. The Sun holds about 99.8% of the solar system's mass.

Volume-wise
With the calculation of volume, we have the numbers here. Sun's volume is approximately 1.412 x 1018 km3. Earth's volume is approximately 1.083 x 1012 km3. Therefore, the Sun's volume is 1,300,000 times the volume of the Earth.

Sun's rotation & magnetic-field
Sun rotates at its axis as it orbits around the galaxy. The sun's axis is tilted about 7.25 degrees concerning the plane of planets' orbits. Since it isn't solid, various sections rotate at different rates. At the equator, the Sun spins around every 25 Earth days, and at poles, it rotates once on its axis every 36 Earth days.
The Sun's magnetic field is about twice as strong as the Earth's magnetic field. But, it becomes highly concentrated in small areas where it can reach about 3,000 times stronger fields. These differences in the magnetic field are the reason why sun-spins very rapidly at the equator. The inner parts of the Sun move faster compared to the surface. Sun's gravity holds the solar system together, including the planets and the tiniest debris to move around it.
It can't harbor life due to its extreme radiation & temperatures. Moreover, life on Earth is possible due to the presence of sunlight & energy.

The temperature of the Sun
Sun's temperature is about 5,600 Celsius (10,000 Fahrenheit). This temperature increases from the outward surfaces to the inwards. The temperature at the core of the sun is the highest. The center can reach about 15,000,000 Celsius (27,000,000 Fahrenheit).

Conclusion
Due to a Sun's large volume, about 1.3 million Earths can fill it, and one can line up about 109 Earth across its surface.

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How many earths can fit in the Sun?