GENERAL KNOWLEDGE

Detailed explanation-1: -Before that, they are called Protostars. 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.

Detailed explanation-2: -Stellar nebula Moments after the Big Bang, energy begins to condense into matter, protons and neutrons are formed, and then the first element (hydrogen) is formed. Hundreds of millions of years later in stellar nebulae, the hydrogen gas clouds coalesce and, under gravity, form protostars.

Detailed explanation-3: -A protostar looks like a star but its core is not yet hot enough for fusion to take place. The luminosity comes exclusively from the heating of the protostar as it contracts. Protostars are usually surrounded by dust, which blocks the light that they emit, so they are difficult to observe in the visible spectrum.

Detailed explanation-4: -Star birth Star formation begins when hydrogen gas is pulled into a dense ball by gravity. Before it begins producing heat and light, this ball of gas is known as a protostar.