Let's say we want to build a model of the sun and Earth alone. Earth has a radius of about 6,371 kilometers (3,959 miles), but let's represent this with a marble 1 centimeter in diameter.

Fact check: Flat Earth claim based on gas pressure fails to account for gravity's impact. Researchers have confirmed the sun and moon's actual sizes and positions in space through various ...

Learn the differences between our Earth, the Sun and the Moon. Then explore how together they create day and night and our different seasons with their orbits.

The claim: Moon visible in the daytime proves Earth is flat. A Jan. 3 Instagram video shows what appears to be a cellphone video panning between the sun and moon in a cloudless sky in the daytime.