Hi Darnun,
A documentary on Foxtell last night, "The Universe". They discussed dark matter and dark energy.
Not much is known about it but they are using the concept to explain the acceleration of the distances of heavenly bodies. They are flying apart at greater rates as time advances.
They also claim that this dark energy will be responsible for galaxies to fly apart and the solar system will follow suit. Followed by disruption of the planets themselves and even down to atoms. Its like the opposite of gravity.
I have a copy of the program.
Cheers Marty