What must occur for a protostar to become a star?
A protostar becomes a main sequence star when its core temperature exceeds 10 million K. This is the temperature needed for hydrogen fusion to operate efficiently. … The more massive the star, the faster everything happens. Collapse into a star like our Sun takes about 50 million years.
How long does it take for a protostar to become a main sequence star quizlet?
How long does it take for a protostar to become a main-sequence star? anywhere from less than a million years to 100 million years, depending on the mass of the star. What are the stages in order of the life track of a star like a Sun?
What temperature is required to initiate nuclear fusion in a stellar core?
15,000,000 degrees Celsius
Why do star clusters provide excellent tests for theories of stellar evolution?
Why do star clusters provide excellent tests for theories of stellar evolution? The stars in any particular cluster formed at roughly the same time from the same primary material and under the same environmental conditions. What is the force that keeps a main sequence star from blowing apart?
How long does a star live for?
Generally, the more massive the star, the faster it burns up its fuel supply, and the shorter its life. The most massive stars can burn out and explode in a supernova after only a few million years of fusion. A star with a mass like the Sun, on the other hand, can continue fusing hydrogen for about 10 billion years.
How does a star die?
Stars die because they exhaust their nuclear fuel. … Really massive stars use up their hydrogen fuel quickly, but are hot enough to fuse heavier elements such as helium and carbon. Once there is no fuel left, the star collapses and the outer layers explode as a ‘supernova’.
At what stage of evolution do T Tauri stars occur?
What can we learn about a star from a life track on an HR diagram?
What can we learn about a star from a life track on an H-R diagram? The surface temperature and luminosity the star will have at each stage of its life. When does a protostar become a main-sequence star?
What is the minimum mass of a star?
J.”>about 75 M J.
Which star is the hottest?
Just for comparison, our Sun, which actually looks white from space, measures about 6,000 Kelvin. The hotter the star, the further up the spectrum you go. The hottest stars are the blue stars. A star appears blue once its surface temperature gets above 10,000 Kelvin, or so, a star will appear blue to our eyes.
At what temperature does hydrogen fusion begin?
13 million K
What happens when a star dies NASA?
Supernovae Leave Behind Neutron Stars or Black Holes
In a supernova, the star’s core collapses and then explodes. In massive stars, a complex series of nuclear reactions leads to the production of iron in the core.
Why does dust Redden starlight?
Why does dust redden starlight? It scatters optical and shorter-wavelength light. … Dust clouds absorb starlight and re-emit it as invisible ultraviolet radiation.
What is the meaning of Zero Age Main Sequence?
Zero Age Main Sequence (ZAMS) is the time when a star first joins the main sequence on the Hertzsprung-Russell diagram (HR diagram) by burning hydrogen in its core through fusion reactions.