Sun’s size: how many Earths fit?

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The sun is 100 times the diameter of Earth and can fit about 1 million Earths inside. The sun’s mass accounts for 99.86% of the solar system. About 1.3 million Earths could fit inside the sun if empty space wasn’t needed. VY Canis Majoris is the largest known star.

It is estimated that about 1 million Earths could fit inside the sun. The sun has a diameter that is about 100 times the diameter of the Earth. The sun is a spherical shape, so to determine how many Earths could fit inside it, the difference in diameter must account for three dimensions: top to bottom, left to right, front to back, and everywhere in between. Since 100 Earths could line up across the sun, this number is multiplied by itself three times – 100 x 100 x 100 – to calculate how many Earths could fit within the sun.

Read more about the size of the Earth and the sun:

The Earth and all other planets together account for only 0.14% of the entire mass of the solar system, while the sun accounts for 99.86%.
The laws of physics prevent smaller objects from fitting into a larger object without accounting for an empty space. If this empty space weren’t needed, about 1.3 million Earths could fit inside the sun.
The largest known star is called VY Canis Majoris and is estimated to be 1,800 to 2,100 times the size of the sun.




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