Tug of war between gravity and dark energy:

The energy from the Big Bang drove the universe's early expansion. Since then, gravity and dark energy have engaged in a cosmic tug of war. 

Gravity pulls galaxies closer together; dark energy pushes them apart. Whether the universe is expanding or contracting depends on which force dominates, gravity or dark energy #gravity #darkenergy

This statement by Soumendra Nath Thakur highlights the ongoing struggle between two fundamental forces in the universe: gravity and dark energy. The analogy of a "tug of war" depicts the dynamic interaction between these forces, which influence the expansion or contraction of the universe. Gravity, a familiar force that attracts matter, tends to pull galaxies closer together. In contrast, dark energy, a mysterious force associated with the acceleration of the universe's expansion, pushes galaxies apart. The outcome of this cosmic tug of war determines the overall fate of the universe, whether it continues to expand indefinitely or eventually contracts. 

The hashtags #gravity and #darkenergy emphasize the significance of these forces in shaping the structure and evolution of the cosmos.