Kelly's model of the movements of the Sun, Earth, and Moon in space show that the Sun is by far the largest celestial body with the moon and the Earth being of similar size. Tony says, "When I look at the sky, the Moon and the Sun are the same size. The objects for your Sun and Moon should be the same size." Melissa states that the sun and moon are the same size, but only when the moon is full. Otherwise, the moon wouldn't be able to block the sun when we have a solar eclipse. With whom do you agree?

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.

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.