picture-Red and Dead galaxy

This galaxy has many dead stars. This is why
its called a red and dead galaxy.

Birth of a star

A star is born in a nebula, a cloud of hot gas, sometimes from a dead star. There are several types of nebulae and these include an emission nebula, dark nebula, planetary nebula and many more. A star forms when the cloud of gas collapses into a dense ball. 

Artists impression of
a T class star

After it has collapsed and more gas has swirled into it, nuclear fusion starts, if the star fails to star it becomes a brown dwarf which are classes L,T,Y. More gas continues to go into the star until it stops growing. The star is born and now creates a gravitational pull to form gas giants and create terrestrial planets. 

picture-supernova

This is a supernova from hundreds
of years ago

Star classification

So yesterday, we went a bit into star classification but there is more to it.

So the smallest star is a red colour and goes as low as 2,500 kelvin and is M class. Next is K and it is a orange colour star and goes up to 5,200 kelvin, then G, which is what our sun is. G stars are yellow and temperatures can go as high as 6000 kelvin, then F stars which are a white-yellow colour and temperatures can be as hot as 7,500 kelvin, following that are the A class stars which are white in colour. They can be extremely hot at 10,000 kelvin. Second to last is B, they are white-blue and can reach 33,000 kelvin in temperatures. Finally is class O which is blue and can go over 60,000 kelvin.

So they're the main classes, but there are sub- classes as well. They contain numbers ranging from 0-9 and roman numerals from I to V. The numbers are in tenths to the next star class. The Roman Numerals measure the size of the star which shows how much light it gives out.

picture- a Quasar

The light seen from here is 10,000,000 years
old

stars

The sun taken by NASA

A star is a ball of hot gas and plasma reaching temperatures of up to 25,000 kelvin but can go as low as 2,500 kelvin. Stars can be classified by their colour and size by letter these go from: M at the lowest then K,G,F,A,B and then O at the highest, but we will go into more detail later in the topic.

A star has different layers beginning  with the corona , the next is the Chromosphere  which is the only thing to be seen during a total solar eclipse, then its the photosphere and is the visible bit, following that is the Convective zone, after that is the radioactive zone and finally is the core, which reaches 30 million fahrenheit

Well that's the introduction, I know I've touched on stars before, but now its in detail so tomorrow will be the birth of a star so tune in.

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