Answer:
Kelly's model, which shows that the sun is the largest celestial body with the moon and the Earth being of similar size, is the correct answer.
Step-by-step explanation:
The sun is the largest celestial body, but when we look at the sky, the sun and the moon seem to have a similar size. The reason for this illusion is because the sun is far away from our planet, but due to its size, when we see it from the Earth in comparison with the moon, which is smaller than the sun, we think that they have the same or similar size.
The moon always has the same size, what changes is the position of the Earth and the moon in relationship with the sun, which gives the different phases of the lunar cycle.