* By Diameter: The Sun is the largest, followed by the Earth, and then the Moon.

* Sun: 1,392,684 km (865,000 miles)

* Earth: 12,742 km (7,926 miles)

* Moon: 3,474 km (2,159 miles)

* By Mass: The Sun is also the most massive.

* Sun: 1.989 × 10³⁰ kg

* Earth: 5.972 × 10²⁴ kg

* Moon: 7.342 × 10²² kg

So, in terms of both diameter and mass, the Sun is the biggest, followed by the Earth, and finally the Moon.