Why do planets have rings around it?

Answer 1

A planetary ring is a ring of cosmic dust and other small particles orbiting around a in a flat disc-shaped region. The generally accepted theory is that ringed planets have sufficient gravity to attract and hold a lot of space debris that is left over from the matter that originally compressed to form the sun and its planetary system. It is also possible that the debris which we now see as rings was once part of a larger satellite(s) that was broken up either by collisions with other small bodies or by the constant gravitational stress exerted by the planet around which they circulate. The debris also tends to get flattened by the rotation, so we see it as rings many miles wide but less than a mile thick.

Answer 2

Planets have rings around them because of gravitational forces from nearby moons or other objects. These forces can cause material to be pulled into orbit around the planet, forming a ring. The most well-known example of this is Saturn's rings.

Answer 3

The planet must have many small moons that orbit relatively close to the planet in its equatorial plane.