Gravity

 

Gravity, which derives from the Latin word gravitas, which means "weight", is a basic interaction in physics that causes all objects with mass or energy to attract one another. 

The electromagnetic force, the weak interaction, and the strong interaction are all significantly stronger than gravity, which is by far the weakest of the four fundamental interactions. 

As a result, it has no appreciable impact on subatomic particle level phenomena. Yet, at the macroscopic level, gravity is the most important interaction between things and governs the motion of planets, stars, galaxies, and even light.

The Moon's gravity causes sublunar tides in the oceans, just as gravity on Earth imparts weight to physical objects (the corresponding antipodal tide is caused by the inertia of the Earth and Moon orbiting one another).

 In addition, gravity plays a significant role in many biological processes, including gravitropism, which directs plant growth, and the movement of fluids in multicellular organisms. Gravity may affect how the immune system and cells differentiate in the human body, according to research on the effects of weightlessness.

Gravity is responsible for many of the large-scale structures in the universe because it allowed the initial gaseous matter to consolidate and form stars, which then condensed into galaxies.