This means that objects in small orbits travel faster than objects in large orbits. The graph shows how the orbital speed of a planet changes with its distance from the Sun.

For an object to remain in a steady, circular orbit it must be travelling at the right speed. The diagram shows a satellite orbiting the Earth. There are three possible outcomes: If the satellite ...

Orbital maneuvering, also known as deep-space maneuvering, enables propulsion systems to alter the spacecraft's orbit. While ...