Birth of Aldebaran
The star Aldebaran like other stars was formed by dust and gases in space making a small area called a nebulae, where stars are born, and over time it will start to flatten and in the center of the nebulae a protoplanet . Nuclear fusion is a big part in forming a star because after it gains enough mass the atoms inside start fusing together to make a heavier object with the release of energy. During this process it begins to make a protostar, which is the early stage of evolution for a star and you can see images of a protostar below.
nuclear fusion
Nuclear fusion is the process of two atoms colliding with enough force and speed that they fuse together. When Deuterium and Tritium fuse inside stars they break apart afterwards into an extra Neutron and Helium also putting off some energy in the process