Dwarfs

Hi,
I had little pause but now I am coming back.
Today I want to write something about dwarfs because I found them little confusing.
We are talking about dwarfs in Universe not Tyrion.. there are six kinds:

  1. Brown dwarf

    Brown dwarf is the only one which is not star. It is actually extremely big planet which almost made it for the size of star. This term is used because red dwarfs already existed.
    Scientist are not really sure when it comes  to the difference of planet and brown dwarf. Jupiter would have to be more than 50x larger to be brown dwarf.
  2. Red dwarf

    Red dwarfs are “cool” stars. For example Proxima Centauri, the closest star is red dwarf. Their mass has to be about 0.08 of Sun to 0.5 of Sun´s mass. Red dwarfs are extremely common in Milky way as most of stars are smaller than Sun. That picture shows red dwarf and it would be more orange if showed from smaller distance.
  3. Yellow dwarfYellow dwarf is not really a dwarf. It is star which is about the same size like our Sun. Its temperature on the “top” is about 5000 to 6000 K.
  4. Blue dwarfBlue dwarfs are kind of related to red dwarfs because they are just a stage in their live. When red dwarf uses almost all of its hydrogen it will need to equalize with gravity and for that he uses temperature which rises and from red color it will shine in blue. This stage is only hypothetical because red dwarfs lifetime is really long and this could not yet happen.
  5. White dwarfWhite dwarfs are stage of all stars which wont make it to neutron stars or black holes. They are about the size of earth but much denser. From white dwarfs supernovas can explode.
  6. Black dwarfBlack dwarfs are only hypothetical but it is almost sure that they will happen when time comes. They are the next stage of white dwarfs. Black dwarf should not shine anymore because it is cool. They should be also really hard to detect because of their black color.

    Dragallur

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9 thoughts on “Dwarfs

    • Hi,
      so those huge objects are called dwarfs because of their relative size to our Sun. You see there is not any type of dwarf which would be bigger than sun because those are usually called giants. Also this is not really accurate.. I forgot to mention that stars are classified by their color and temperature so yellow “dwarfs” are in class G. You can see the table here: http://en.wikipedia.org/wiki/Stellar_classification#Harvard_spectral_classification
      Well and for G class,
      as I said their temperature is 5000-6000K. Their mass moves around 0.8 to 1.2 of Sun´s mass (yes they can be bigger). Those are stars which are fusing hydrogen to helium and their life time according to Sun´s should be around 10mld. years. They will go through process of red giant and finally they will make it to white dwarf. As you can see from the table on wiki they are also pretty rare.
      Dragallur

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