At http://phys.org/print379871837.html … NASAs Cassini spacecraft has detected a first signal of dust coming from beyond our solar system it is alleged, according to research published in the journal Science (April 2016). Cassini has been in orbit around Saturn since 2004 and it has sampled ice rich dust grains mostly coming from active jets that spray from the surface of the moon Enceladus. However, among these grains are some that stand out as being different, and scientists are assuming they came from interstellar space.
The idea of interstellar dust has been around for a long time – and it may be that Cassini has picked up some of this material. The particular grains in question, when analysed, were surprisingly uniform and it is suggested this is due to repetitive processing in the inter stellar medium – i.e. dust in a star forming region could be destroyed and recondense.
At http://phys.org/print379847605.html … two million years ago, we are told, a supernova exploded and its traces can still be found in the form of an iron isotope found on the ocean floor. German scientists are now saying they have detected the same material in moon rocks brought back by the Apollo Mission.