An article published in the journal “Monthly Notices of the Royal Astronomical Society” reports a study on the importance of the ejection of materials by stars in the last stages of their life in the formation of life forms such as those on the Earth. Professor Michael Smith and PhD student Igor Novikov of the British University of Kent performed a series of computer simulations of processes in protoplanetary nebulae obtaining results that offer important clues concerning the recycling of materials generated in stars and ejected into interstellar space.