What is the evolution of stars?
The Milky Way contains millions to billions of star all different sizes, ages and masses. A normal star like the sun, radiates small amounts of X-rays continuously and larger bursts of X-rays during a solar flare. According to Nasa “The Sun and other stars shine as a result of nuclear reactions deep in their interiors. These reactions change light elements into heavier ones and release energy in the process. The outflow of energy from the central regions of the star provides the pressure necessary to keep the star from collapsing under its own weight”. A star falls when the fuel is used up and the energy of the stars core stops. The nuclear reactions outside the stars core causes the dying star to enlarge outward in the red giant. “If the star is about the same mass as the Sun, it will turn into a white dwarf star. If it is somewhat more massive, it may undergo a supernova explosion and leave behind a neutron star. But if the collapsing core of the star is very great at least three times the mass of the Sun nothing can stop the collapse”.
What is largest star?
The largest star is the VY Canis Majoris. VY Canis Majoris is around 4,000 light years from Earth in the constellation of Canis Major. It is the largest star in the Milky Way. The VY Canis Majoris has a radius of around 1,500 times larger than the sun. Large stars burn fuel much faster which results them only existing for a few million years whereas to small stars like our sun exist for billions of years. It is estimated that the VY Canis Majoris has already discharged half of its mass which has surrounded the star in a nebula cloud. The VY Canis Majoris near the end of its lifespan and it is expected to explode as a supernova in the next 100,000 years. Once the star explodes the collapse of its remaining core could be massive enough to create a black hole. The VY Canis Majoris is around 4,000 light years from Earth in the constellation of Canis Major.