The International Conference and Exhibition on Astronomy, Cosmology and Space Science – OLCACSS-2020 – will be held during November 09-10, 2020 in Vienna, Austria. The congress brings together a multi-disciplinary group of scientists and researchers to present and exchange breakthrough ideas relating to space science. It further aims to promote current research and share experiences among the participants through discussions, presentations and contributions on a more internationally competitive platform. The conference will bring together astronomers, researchers, scientists and education practitioners to improving the impact of astronomy education research and practice. Student attendees will have the opportunity to learn from presentations delivered by eminent scientists, researchers and experts from all over the world covering different fields of astronomy and space science. Different sessions on specific topics will enhance student learning and enables them to achieve progress in their current research. The meeting further facilitates networking opportunities on a global scale among academic and industry professionals to enhance their career and business goals by exchanging ideas and focusing on new developments and innovations in Astronomy and Space Science. OLCACSS-2020 anticipates a huge number of participants around the world to deliver insightful keynote speeches, thoughtful plenary talks and inspiring oral presentations. Symposiums, workshops, round table discussions, and video and poster presentations will be part of this two-day event providing delegates an outstanding opportunity to interact with world class scientists and researchers. The event covers different topics including Astronomy, Cosmology, Particle and Nuclear Astrophysics, Observational Astronomy & Astrophysics, and Space Observation and Exploration among others. We hope this conference will deliberate and discuss all the interesting facets of this exciting topic and will come up with future recommendations that will foster scientific innovation in these fields. We look forward to welcoming you to OLCACSS-2020 in Vienna, Austria.