According to the new research done by the scientists of Lawrence Livermore National Laboratory on comet Wild 2, the inner solar system material had been shipped to the comet-forming territory, at least 1.7 million years back, after the oldest solar system solids formation started its take, which is considered for calculating the age of cometary material from a known comet.

For this NASA launched its Stardust mission to comet Wild 2, which was launched in 1999, and was crafted around the premise that comets preserve pristine remnants of materials helping in the formation of solar system. In 2006, the Stardust returned from its mission with the first samples from a comet.

However, it was expected that the mission might unveil the glimpse of the early solar system with bringing back a mix of solar system condensates, amorphous grains from the interstellar and other stuff, the mission unveiled something more different, which discovered that the comet materials consists of high-temperature materials including calcium-aluminum rich, in a layman's language something which is the oldest objects formed in the solar nebula, which are common in meteorites.