No one knows exactly when life started in the universe. There are several assumptions given but nobody find out exact time frame. Today morning I read an article https://www.scientificamerican.com/article/when-did-life-first-emerge-in-the-universe/?utm_source=pocket-newtab-intl-en and came to know that scientist are still working on this topic. According to them, "About 15 million years after the big bang, the entire universe had cooled to the point where the electromagnetic radiation left over from its hot beginning was at about room temperature." It is quoted from the article. However, the research is not yet completed. It is going on. I am really excited to know when life started on the earth. Is there any other planet in the universe where life exist? However, scientists haven't yet found another planet like earth where life exist. The article has more information. You can read it to acquire the info. #Science