Hello everyone using this presentation I am going to answer the following question: What types of
stars are there? For the record this is going to be surface level information , so there are 6 types of
stars from smallest to biggest there are white dwarfs, neutron stars, red dwarfs, solar type stars, hot
blue stars or blue giants and red giants. Some of these have subcategories.
Starting of with white dwarfs as the name suggests its white. This is the final evolutionary state of
stars. They are in between 150000K and 4000K or about the same in degrees Celsius. They go down
in temperature because they don’t have a way of creating energy. White dwarfs are created by red
giants that have imploded. Which means they have a lot of mass to put that in perspective if there
was a white dwarf the size of the earth it would have the same mass as the sun.
Next neutron stars. Neutron stars are formed by the collapsed core of a red supergiant. They are so
dense that they have fused into pure neutrons. They are about 10 km in radius and have a surface
temperature of 600000K. Fun fact a teaspoon of a neutron star would weigh 6 billion tons.
On to Red dwarfs. Red dwarfs are the smallest and coolest kind of star on the main sequence. These
are the most abundant type of star. They have a surface temperature of 3000K because of their
relatively low temperatures they last for trillions of years.
Now solar-type stars, stars like our sun for example have a surface temperature of 5800K and are
made of 73% hydrogen and 25% helium.
Blue giants or Hot blue stars are very shortlived for stars they are around for a few million years. This
is because of their temperature and size since they have a temperature of around 10000K. generally
these are about 5 to 10 times the size of the sun.
The final and biggest type of stars are red giants. They have a temperature of 5000K and are close to
200 times the size of the sun. at the end of their lifespan red supergiants will form a neutron star or if
they are even bigger than the average supergiant they wil form a black hole.
So today we have learned that there are 6 types of stars.
Thank you for listening. Any questions?