As recently as the 1960s, most scientists doubted molecules could exist in interstellar space at all — the radiation there was thought to be too harsh for anything much beyond atoms and a few basic free radicals to survive. (scientificamerican.com)
When the researchers take into account the numbers of single - star versus binary systems and the numbers and sizes of planets they're likely to have, they estimate that more than three - fourths of the asteroids cast into interstellar space come from solar systems that have two suns. (sciencemag.org)
We tend to think of interstellar space as utterly empty, and with good reason. (discovermagazine.com)