Well,a proto star is a new star.So whena new star forms the other star is no longer a proto star.
That depends on the mass of the proto-star.
A Dwarf Star
When a star "goes off the main-sequence" it generally means the star has run out of hydrogen fuel and is beginning the post-main-sequence or its end of life phase. The main sequence of a star is the time where it is no longer just a proto-star but is burning hydrogen as a primary source of fuel.
A Main Sequence star.
Depending on the Mass of the core, they either become a Neutron Star or a Black Hole.
The temperature at which hydrogen fuses is 10,000,000 degrees Kelvin. This is the minimum temperature the core of a proto star has to have to become a true star.
That depends on the mass of the proto-star.
Compression. Whenever anything is compressed, it heats up. In a proto-star, clouds of hydrogen gas are compressed by gravitational attraction, and the compression heats the gas.
A "proto-star".
They are called oncogenes.
Matter from nebula that condense make proto star.
No one. It comes from the Greek - proto - meaning first. So first star - a protostar.
In the words of my physics teacher 'Not in your lifetime!' Planets form from a disk of dust and gas when the star is just a proto-star. Planets cannot form after the star has been formed.
A 'proplid', or a proto-stellar object, often called a proto-star, and some believe (as I do) that 'Herbig-Haro Objects', are newly formed stars. At any rate, a star is a mass of gas in space made hot by nuclear reactions.
A disk of gas ad dust that forms round a proto-star as the star coalesces at the center and from which planets accurate. The related links below give more information.
Our Solar System Formed from the remnants of a star wich went supernovae (at least approx 5 billion years ago) the dust from that star started to condense (due to the passing another star or some other mechanism), spinning counter-clockwise, the pressure at the center of this cloud became great enough to start a process know as nuclear fussion (triple alpha process) creating a proto-star, wich was significantly dimmer and smaller than todays Sol. The remaining dust accreted to from proto-planets (maybe upwards of 100), These proto-Planets smashed into each-other and merged to become the inner planets. As for our gas-giants, they formed from cold gas and dust, beyond what is known as the "Frost Line" due to the required colder temperatures to form Gas Planets.
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