http://www.cnn.com/2016/04/16/tech/cosmic-dust-nasa-cassini-irpt/index.html (CNN)NASA just discovered some special particles floating in our cosmic neighborhood. The Cassini spacecraft, which has been orbiting Saturn since 2004, has detected alien dust that came from outside our solar system. A very interesting article to read. I wonder what the dust is comprised of?
Saturn Spacecraft Samples Interstellar Dust | NASA This is unlike interstellar grains in meteorites. Those grains have a variety of compositions. The researches suggest that these grains got processed in the interstellar medium, like by supernova shock fronts.