5.+Protostar


 * __Protostar:__**




 * __Description:__**

A **Protostar** is an early stage in the development in a **star** when. For a star similar in size to our sun, the phase takes 100 000 years to complete. It is defined as being a large object that is formed by the fusing of giant molecular clouds but has not collapsed enough for **nucluer fusion** and becoming a main sequence star. the clouds are mostly comprised of hydrogen and helium gases. The early star is covered in a dense shield made of gas and dust that prevents and light from being released but allows microwave radiation to pass. The protostar will soon become a **T Tauri star** which then developes into a **main sequence star**. media type="youtube" key="Rm3Sj8qAaWg" height="344" width="425"
 * __Habitability:__**

There is a 0 % chance of habitability on a protostar, it would be far too hot for anylife to exist. There would not be any liquid water present and the protostar would not have a sustainable atmosphere, The radiation immited would be be too strong and the only solid object would most likely be the center object or start itself


 * __Justification:__**

There is no evidence of habitability and its unreasonable to think that any life could exist on something which has a solid surface of immense heat and radiation and where liquid water cannot exist.


 * __Glossary__

Protostar: '**A stage in the evolution of a young star after it has fragmented from a interstellar gas cloud but before it has collapsed sufficiently for nuclear fusion reactions to begin'(Encyclopedia of Science )
 * Nuclear fusion**: The reaction when nuclei combine to form larger nuclei realesing energy in the process
 * Star:** 'A celestial body of hot gases that radiates energy derived from thermonuclear reactions in the interior' (Wordnet Princton)
 * T Tauri star**: 'A class of very young, often flaring stars on the verge of reaching the main sequence.' (Chandra Harvard resources)
 * Main Sequence Star**: A star which undergoes fusion in its core when hydrogen turns in to helium