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Why does the temperature of a protostar increase?
As gravity pulls more material toward the center of the protostar, the pressure inside the protostar builds.
When does a protostar become a star?
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".
The length of a stars life is determine by what?
By mass . The smaller the star the longer it shines. Stars that are 20 times the mass of the sun only last 10 million years or so but will be thousands of times brighter than our sun. Our sun will shine for 10 billion years (it is about half way through it's life). Small stars called red dwarfs less than a tenth of the suns mass may shine for a trillion years or more but will be less than 1/100 of our sun's brightness.
What is the time taken by a to orbit the sun is a?
more than a million years
What species absorbs photons in a protostar's outer layers?
H- Comment: I haven't checked this, but I think "neutral hydrogen atoms" is a more likely answer.
Why does the temperature of a protostar increase?
As gravity pulls more material toward the center of the protostar, the pressure inside the protostar builds.
Are protostar a star?
A protostar is more like a stage previous to a star - before it ignites.
Why does temperature increase more rapidly in a more massive protostar than in a less masive protostar?
because the jews said so
What is the first step of stellar evolution?
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.
What time references best fits the concept of geologic time a dozen years a hundred years a thousand years a million or more years?
a million or more years
When does a protostar become a star?
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".
When was More Shine created?
More Shine was created on 2005-09-27.
Would geologic time be more like 12 years 100 years 1000 years or 1 million years?
Geologic time is very long, so a million or more years is the best choice.
How old is the Nile River?
As old as history itself, at least a few million years.
What best fits the concept of geologic time a dozen years a thousand years a hundred years or a million or more years?
Millions of million years, Billions of years, (Aeon).
How old was the Sun a million years ago?
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.
How long can a star shine for?
Small dim stars can shine for a trillion years or more. The more massive a star is, the BRIGHTER it is, and the faster it burns out. Our Sun is perhaps just a bit larger than average, but not by a whole lot; our Sun has already burned for 4.5 billion years or so, and we can expect as much more. But it won't be the Sun as we know it; in 3 billion years or a little more, it will expand into a red giant. Very large stars like Betelgeuse are already quite old and about to die - spectacularly! - at fairly early ages. (Some time within the next 100,000 years) And yet, Betelgeuse is only about 100 million years old!
