What keeps each of these orbits happening rather than having us go travelling off away from the sun, is something called centripetal force. TIM PEAKE:And for an explanation of what that is ...

Gravitational attraction provides the centripetal force needed to keep a planet in orbit around the Sun, and a satellite in orbit around a planet. For example, gravitational attraction between the ...

In other words, find an orbit with a period of 24 hours. Recalling the relationship between force and period of circular motion, the period, radius and mass of the satellite are related to the ...