Comet Wild 2 formed 4.5 billion years ago and is a relic of the birth of the solar system. In 2006, NASA brought pieces of it down to Earth.

It's been a 'wild' ride for the comet sampled by NASA's Stardust mission

Source: space
Source Link: https://www.space.com/nasa-wild-comet-dust-solar-system-formation-discoveries