Modeling the Earth and moon would be easier. If we use that marble for the moon, Earth would be a tennis ball, with a diameter of 6.7 centimeters.

This diagram easily breaks down the science of what's happening in space with the sun, moon, and Earth during the April 8 total solar eclipse.

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.

Only the giant impact explains what we see in moon and Earth samples today. Related Stories. Scientists discover ‘hidden structures’ deep beneath the dark side of the moon.

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.

Astronomers have long known that the Earth and Moon are younger than 4.6 billion years, because that's when the solar system got its start. A huge cloud of dust and gas collapsed inward, ...