In terms of size, the order from smallest to largest is as follows: the Moon, Earth, and a star.
The Moon is Earth's only natural satellite, and it is significantly smaller than both Earth and stars. Its diameter is approximately 3,474 kilometers (2,159 miles), making it about one-fourth the size of Earth.
Earth, our home planet, has a diameter of approximately 12,742 kilometers (7,918 miles). It is larger than the Moon but still much smaller than stars.
Stars, on the other hand, are incredibly massive and much larger than both the Moon and Earth. Stars come in various sizes, with diameters ranging from a few thousand kilometers to several million kilometers, depending on the specific type of star. For example, the diameter of our closest star, the Sun, is about 1.4 million kilometers (870,000 miles). Other stars in the universe can be significantly larger or smaller than the Sun.
So, in terms of size, stars are generally much larger than both the Moon and Earth.