SOLAR SYSTEM

Detailed explanation-1: -A protostar is formed as gravity begins to pull the gases together into a ball. This process is known as accretion. As gravity pulls the gasses closer to the center of the ball, gravitational energy begins to heat them, causing the gasses to emit radiation. At first, the radiation simply escapes into space.

Detailed explanation-2: -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-3: -A nebula is a giant cloud of dust and gas in space. Some nebulae (more than one nebula) come from the gas and dust thrown out by the explosion of a dying star, such as a supernova. Other nebulae are regions where new stars are beginning to form.

Detailed explanation-4: -Gravity can pull some of the gas and dust in a nebula together. The contracting cloud is then called a protostar. A protostar is the earliest stage of a star’s life.

Detailed explanation-5: -The protostar phase is the earliest one in the process of stellar evolution. The phase begins when a molecular cloud fragment first collapses under the force of self-gravity and an opaque, pressure supported core forms inside the collapsing fragment.

Detailed explanation-6: -Over time, the hydrogen gas in the nebula is pulled together by gravity and it begins to spin. As the gas spins faster, it heats up and becomes as a protostar. Eventually the temperature reaches 15, 000, 000 degrees and nuclear fusion occurs in the cloud’s core.

Detailed explanation-7: -In the densest part of the nebula, gravity pulls gas and dust together. A cloud of gas that has enough mass to form a star is called a PROTOSTAR. A star is finally born when the gas and dust from a nebula becomes so dense and hot that nuclear fusion starts.