Two big questions are at the centre of research regarding the emergence of life on Earth and the possibility of life in the universe: (a) is there life on other celestial bodies? and (b) when did life first appear on Earth ? To throw light on these questions, reliable methods for the detection of life using unambiguous biosignatures are essential. In this respect huge progress has been made during the last years. For example, new space missions like ECHO are planned to characterise atmospheres of exoplanets and sophisticated methods for detecting life in ancient geological formations have been developed. This meeting will to bring together astronomers, geologists, biologists and other interested scientists to share interdisciplinary approaches to detect signs of life on early Earth and other celestial bodies (including exoplanets) and to elucidate the environmental limits and origins of life.