* Sun's Diameter: The sun's diameter is approximately 865,000 miles (1,392,000 kilometers).

* Earth's Diameter: The Earth's diameter is approximately 7,926 miles (12,756 kilometers).

Calculation:

1. Divide the sun's diameter by Earth's diameter: 865,000 miles / 7,926 miles = 109.1

Answer: You could line up approximately 109 Earths across the diameter of the sun.