The Sun is the largest object in the Solar System. The Sun’s huge gravitational field keeps many other objects – planets, dwarf planets, asteroids and comets – in orbit around it.

Gravity provides the force needed to maintain the stable orbit of planets around a star and also of moons and artificial satellites around a planet. The moons around planets in the Solar System ...

Astronomers posed over the past decade that dark comets, or objects that resemble asteroids but move like comets, may exist.

For centuries, astronomers have sought to understand the complex dance of planetary motion. The ancient belief that planets ...