Answer:
The force that is expanding the universe at its present rate is called as the dark energy.
Step-by-step explanation:
The force which is found to be responsible for the expansion of the universe is known as dark energy. The far away galaxy is moving apart from one another at a greater speed, hence the universe is expanding day by day since the period of big bang. The expansion of the universe is higher. It is also found that a vacant space is present which is providing the repulsive force and making the universe to expand. This complete phenomena is dark energy.