Helium nucleus

A helium nucleus, also known as an alpha particle, consists of two protons and two neutrons, making it relatively stable and heavy compared to other atomic nuclei. It's the product of nuclear fusion in stars, where hydrogen atoms combine under immense pressure and temperature. Helium nuclei are significant in both stellar processes and nuclear reactions, as they can release energy. Found in balloons and stars alike, helium is the second most abundant element in the universe, playing a crucial role in both astronomy and various scientific applications on Earth.