When you talk to an astronomer about the evolution (actually a poor use of the term, better to say development) of stars, you may be told about how there are three major generations of stars, Population I, Population II and Population III stars. The oldest stars belong to the group called Population III stars. Our relatively young star, the Sun, belongs to the Population I star group. Now a group of American astronomers have proposed that there may have been stars even before Population III stars. These primordial stars are called dark stars because they were formed from dark matter. If correct, these astronomers point out that unlike our current stars, who produce energy by fusion of hydrogen into helium, these dark stars produce energy by annihilation of Weakly Interacting Massive Particles or WIMPs. The authors conclude that dark stars would result in the formation of black holes, something only the most massive “normal” stars can form. You can read more about dark stars here in a pre-print of a paper to be published in the Astrophysical Journal.