The vast Universe remains a great mystery to humanity. Is there life outside of Earth? What would aliens be like or how would we communicate with them? We have been asking ourselves these kinds of questions for over 2,000 years and the answer, thanks to researchers, seems to be getting closer every day. To explain the knowledge we have so far about aliens and shed some light on scientific research, CosmoCaixa is launching the exhibition Extraterrestrials. Is there life outside of Earth?, this Tuesday, February 25.