SOLAR SYSTEM

Detailed explanation-1: -1 Gravity causes the particles in a nebula to be attracted to each other. 2 As particles move closer together, collisions cause pressure to increase and particles are pushed apart. 3 If the inward force of gravity is balanced by outward pressure, the nebula becomes stable.

Detailed explanation-2: -A star’s life is a constant struggle against the force of gravity. Gravity constantly works to try and cause the star to collapse. The star’s core, however is very hot which creates pressure within the gas. This pressure counteracts the force of gravity, putting the star into what is called hydrostatic equilibrium.

Detailed explanation-3: -The nuclei crash into each other so hard that they stick together, or fuse. In doing so, they give off a great deal of energy. This energy from fusion pours out from the core, setting up an outward pressure in the gas around it that balances the inward pull of gravity.

Detailed explanation-4: -Inside a nebula, there are areas where gravity causes dust and gas to “clump” together. As these “clumps” gather more and more mass their gravitational pull increases, forcing more atoms together. This process is known as accretion, and the result is a protostar.

Detailed explanation-5: -The nebula’s structure is sustained through hydrostatic equilibrium, that is, a balance between two opposing forces acting within it: the gaseous pressure (the gas’s tendency to spread and disperse through space and the interparticle gravitational forces that attract particles towards each other.