 In comparison, the Sun has a slightly higher temperature of 5778 K but is significantly younger, at 4.5 billion years old.The star is very metal-rich, with a metallicity ([Fe/H]) of about +0.36, or about twice the amount of iron and other elements heavier than Hydrogen and Helium than the Sun.This would explain how two massive gas giants, as well as a Mega-Earth, were able to form around the same star.