Future of the Our Universe.

After the Big-Bang, Our Universe is expanding continuously at a rate equal to Hubble Constant. Physicists and Cosmologists are continuously observing this expansion to predict the future of Our Universe but further advances are required in fundamental physics before it will be possible to know the ultimate fate of Universe.Our Universe contains 73% of Dark energy, 4% of Atoms and 23% of Dark matter. However, Scientists are agree that this fate will depend on three things:

1. On Universe Overall Shape or Geometry.

2. On how much Dark Energy (An invisible and hypothetical form of energy with   repulsive gravity that permeates all of space and responsible for the expansion of the universe )it contains.

3. On the Equation Of State.      

   
Based on the prediction, Our Universe will have any of the following states :

Big-Crunch

If the shape of the Universe is closed like sphere and Universe lacks the repulsive force of Dark Energy, then after a region of hundred of billion years, Gravity attraction force will overcome the Dark energy repulsive force giving birth to Contraction Of the Universe. This will continue until all the matter get converted into a final Singularity, a mirror image of Big-Bang Known as Big-Crunch.This model offers the possibility of an oscillating Universe between two states Known as Big-Bounce where Big-Crunch is succeeded by Big-Bang .  

Big-Rip

If the shape of the Universe is open curved and the Dark Energy throwing into equation, then it will not only expand the universe but also accelerate it and development of the things will depend on the nature of Dark energy  which is unknown to us. After a time period of 35-50 billion years,the acceleration will increase without limit, it will overcome the Gravitational Force of attraction and Electromagnetic Force, then the Stars and Galaxies will literally torn apart into particle known as Big-Rip. 

Big-Freeze

The third and the most likely event to occur is Big-Freeze or Big-Chill or also known as Heath Death.This possibility is based on the current observations and knowledge. In this scenario, the Universe will expand continuously and gradually runs down to a state of Zero Thermodynamic free energy and the temperature will be Absolute Zero, where our Universe will become too clod to sustain life and there will be only Cold Dead Planets and Black Holes.