Main+Sequence+Stars+4A

*Main sequence is a stage where most Stars spend their lives. The Sun will spend 10 billion years in this stage. Sirius and Alpha Centauri are also in this phase along with the sun. These stars burn Hydrogen in there cores, and that's what gives them the name Main sequence stars. When a main sequence star leaves it's childhood stage they are then called Dwarf stars. When this stage is over they settle into their adult years.When a star finishes nuclear fusion it shines energy into space.The star starts to contract over billions of years,it makes up for heat and the light energy lost. The stars temperature, density, and pressure at the core increase. The temperature in the core rises over time, because the star gives away energy--while it's also slowly contracting.