A PHP Error was encountered

Severity: Notice

Message: Only variable references should be returned by reference

Filename: core/Common.php

Line Number: 257

Space - Oort-cloud

Oort Cloud

A huge spherical region at the very edge of the Solar System that is the source of the long-period comets. Long-period comets take over 200 years to complete a full orbit of the sun. It is thought that gravitational forces from other stars dislodge objects in the Oort Cloud to make them enter the Solar System on a path that takes them around the Sun where they are captured in orbit.