This question has a two part answer. The first part is that an asteroid hitting the earth and the second part is massive volcanoes erupting around the world.
The peer review is the process of the review by the other members involved in the study of the same topic. The peer review increases the validation of the paper and is ready to be published after wards. Hence, after the peer review is completed and the claim present in the paper stand to be true, then the paper is ready to publish and the nest step must be the publishing of paper.
