... Stars@ESO . ... Very Old Stars . ... An international team led by astronomers in Brazil has used ESOБЂ™s Very Large Telescope to identify and study the oldest solar twin known to date. Located 250 light-years from Earth, the star HIP 102152 is more like the Sun than any other solar twin БЂ” except that it is nearly four billion years older. ... The team studied two solar twins [2] БЂ” one that was thought to be younger than the Sun (18 Scorpii) and one that was expected to be older (HIP 102152). ...