Helmholtz's contraction theory says the sun is young (Talk.Origins)
- Helmholtz proposed that the sun's energy comes from gravitational contraction. Under this theory, the sun could not be more than about 20 million years old.
Source: McDowell, Josh and Don Stewart, 1981. Reasons Skeptics should consider Christianity. San Bernardino, CA: Here's Life Publishers, Inc.
Creationists have played with this concept, mainly as a possible way of dealing with what was then of a lack of solar neutrinos. The discovery of the missing neutrinos has put an end to such theories.