Planetary Environments and Origins of Life How to reinvent the study of Origins of Life on the Earth and Life in the Universe under the light of exoplanetology progress

Abstract. The present strategies proposed for the search for the origins of life and for extra-terrestrial life are mainly based on Earth-life and its adaptation along geological eras to the Earth environment. These strategies should however face the difficulty that one cannot as yet accurately date the appearance of life on Earth, and consequently one cannot identify a chronology of phenomena related to the transition from the non-living to the living and the dependence of these phenomena on the Earth environment. In this paper, we present new approaches to search for the origins of life on the Earth and next, for life on exoplanets. This study is based on our experience gained at the head of the CNRSc interdisciplinary research initiative "Environnements Planétaires et Origines de la Vie (EPOVd), and on the analysis of the projects the initiative funded. 1 Classical paradigm and associated strategies for the detection of life in the universe and their limitations Since 1995 and the detection of the first exoplanet around a solar-like star [1], more than a thousand planetary systems have been discovered within our galaxy [2]. Even if 97 % of them have been discovered by indirect techniques of detection (mainly by radial velocity measurements and transi