The beginning establishes a tone of sadness and grief, with characters searching for answers. We are shown events taking place just before a shocking and unusual event that seems to be based on real-life possibilities, and the consequences could be amazing and frightening. It’s genuinely entertaining if you appreciate the scientific ideas explored by the movie as though they were factual. I haven't enjoyed a film this much in quite some time, and I am thrilled by the scientific explanations that support the story’s central idea.

Source on TMDB