If you measure the period in Earth years and the orbit’s semi-major axis in astronomical units, the equation simplifies to period squared equals semi-major axis cubed.

A new study indicates the collision of Theia and the Earth about 4.5 billions years ago might have created more than one moon ...

Scott Manley is indicating that what I have been observing in the Barry-1 satellite orbital variance is not enough proof for the IVO quantum drive.

A seismic shift occurred in astronomy during the Scientific Revolution, beginning with 16th-century polymath Copernicus and his proposal that the Earth revolved around the sun. By the 17th century, ...

In our solar system, a planet’s Hill sphere is dictated by its orbit (more specifically, its orbit’s semi-major axis — the long semidiameter of an oval), its mass, and the Sun’s mass.