Helium was discovered from the light spectrum of the Sun.A pattern of spectral lines that had never been observed before were due to an unknown element in the Sun.Helium is produced in the Sun from the nuclear fusion of hydrogen.Helium is also present on earth as alpha particles produced from the radioactive decay of elements such as uranium.In the liquid state below 2.17K it becomes a superfluid. This is a fluid that has no resistance to flow.It can escape from an open container by creeping as a thin film up and over the sides of the container.