All stars begin their evolution in large clouds of gas and dust called nebulae. These nebulae can be found within galaxies, including our own Milky Way galaxy. The gas and dust within these nebulae slowly start to collapse due to gravitational forces, leading to the formation of a protostar. As the protostar continues to collapse, its core becomes hotter and denser, eventually reaching a point where nuclear fusion reactions begin and a star is born.
All stars begin their evolution in large clouds of gas and dust called nebulae. These nebulae consist mainly of hydrogen gas, along with some helium and traces of other elements. Gravitational forces cause these clouds to contract and eventually form dense regions known as protostars. As the protostar continues to collapse under its own gravity, the temperature and pressure increase until nuclear fusion ignites in its core. This marks the birth of a new star.
