Astrophysics and Space Science publishes original contributions invited reviews and conference proceedings over the entire range of astronomy and astrophysics. It publishes observational and theoretical papers as well as those concerned with the techniques of instrumentation. Observational papers can include data from ground-based space and atmospheric facilities. Astrophysics and Space Science has published and continues to publish landmark papers in its field and is an indispensable source of information for professional astronomers astrophysicists and space scientists.