yes.
The temperature of a protostar increases due to gravitational contraction. As the protostar contracts, potential energy is converted into kinetic energy, causing the particles to move faster and collide more frequently, resulting in an increase in temperature. This process eventually leads to the ignition of nuclear fusion and the star's main sequence phase.
During the T-Tauri phase of a protostar, it undergoes significant changes in its structure and behavior. The protostar becomes more stable and begins to generate its own energy through nuclear fusion. It also develops a strong magnetic field and may exhibit intense solar flares. Additionally, the protostar starts to clear out the surrounding gas and dust, paving the way for the formation of a planetary system.
The basic idea is that the protostar contracts, under the influence of gravity, until it gets dense and hot enough to undergo nuclear fusion. You can find more details at the Wikipedia article "Protostar".
In a protostar's outer layers, hydrogen atoms absorb photons. This process triggers nuclear fusion reactions that release energy and contribute to the protostar's growth and development into a stable star.
more than a million years
A protostar is more like a stage previous to a star - before it ignites.
because the jews said so
The temperature of a protostar increases due to gravitational contraction. As the protostar contracts, potential energy is converted into kinetic energy, causing the particles to move faster and collide more frequently, resulting in an increase in temperature. This process eventually leads to the ignition of nuclear fusion and the star's main sequence phase.
a million or more years
The formation of a protostar from a nebula. As the protostar forms, it accretes more mass from the cloud and spins. As it gains more mass, it eventually becomes massive enough to ignite the core and become a star. The protostar is the first step in the evolution of any star.
it's a protostar
More Shine was created on 2005-09-27.
Geologic time is very long, so a million or more years is the best choice.
As old as history itself, at least a few million years.
The sun was roughly 4.6 billion years old a million years ago. The margin for error on the estimated age of the sun is more than a million years.
The universe has existed for more than 14 billion years, the sun for more than 4 billion years - both well over 3 million years.
About 60 million years or more