You have probably seen some of those warnings about how NASA warned that an asteroid would hit the earth and cause a huge blast that will cover the atmosphere with dust for decades. There are possibilities that this could happen, but why say NASA said so? You probably found the news on a blog with very low credibility.
There is need to research before posting about some things. Never assume you know everything about a specific subject. Let me share an example of what happened to Donald trump with you:

Who do you think made the mistake? Was it that Trump needed to research on Geography before making that tweet or did Wale fail to comprehend? Be the judge.