Over forty interstellar molecules have been found, ranging from simple OH radicals to molecules with over a dozen different atoms, including a few polycyclic. Their significance lies in that planets are formed from such nebulas( area of the cloud), so this tells us what may be found. Solution Over forty interstellar molecules have been found, ranging from simple OH radicals to molecules with over a dozen different atoms, including a few polycyclic. Their significance lies in that planets are formed from such nebulas( area of the cloud), so this tells us what may be found..