What known materials exist in space but not on earth?

 There are various materials in space that aren't found on Earth, such as exotic minerals and ices formed under extreme conditions. Some examples include presolar grains, which are remnants from before the formation of our solar system, and complex organic molecules like those found in the atmospheres of distant planets. 

Additionally, certain types of ices and minerals can form in the extreme temperatures and pressures of space, contributing to the diversity of materials beyond our planet.

Presolar grains are microscopic particles that originated in other star systems before our solar system formed These grains contain clues about the conditions and processes in those distant stellar environments.

Complex organic molecules, found in the atmospheres of celestial bodies, are composed of carbon and other elements. They play a role in the chemistry of space and may provide insights into the potential for life beyond Earth.Ices and minerals in space can form in environments with unique temperature and pressure conditions. 

For instance, certain ices might exist on cold bodies like comets, and specific minerals could form in the extreme conditions near certain types of stars.Studying these materials helps scientists understand the broader composition and evolution of the universe.