interstellar grain वाक्य

He hoped that such interstellar grains could be discovered within meteorites; and he also advanced a related theory that he called " cosmic chemical memory " by which the effects of stardust can be measured in meteoritic minerals even if stardust itself no longer exists there.
Hildebrand believes the interstellar grains within the Tagish Lake fragments could have originated long ago on the surface of some carbon-rich " red giant " star and were pushed out into space, sailing under the pressure of that star's solar wind of sub-nuclear particles.
The arguments are that : given an observed typical grain diameter " a ", the time for a grain to attain " a ", and given the temperature of interstellar gas, it would take considerably longer than the age of the Universe for interstellar grains to form.