A comet appears to be a bright light in the sky that comes out of nowhere, with no warning. Therefore, a comet in a dream represents something important that has happened in your life unexpectedly, and over which you can have no control.
It can often represent a sudden, traumatic experience. For example, it can symbolize shocking news or a sudden, unexpected loss.
Traditionally, a comet is an omen of bad luck and therefore it often has negative connotations. However, a dream about a comet can also have a positive meaning.
A comet in a dream can represent sudden insight – an idea or the solution to a problem that comes to you in a flash. If you dream about a comet, your dream can be a message that the answer to your problem is right in front of you.