What are the chances that aliens have visited earth?
First of all, just because someone claims to have seen an alien or a UFO, it doesn’t mean that we have proof that aliens exist. There are many other explanations for what people see. Also, just because a newspaper or magazine publishes an article about aliens, that doesn’t count as proof either. Newspapers often report strange things when they first happen but then fail to report the simple explanation that is discovered a few days later. It is important to know the difference between science and pseudoscience. Science relies on strong evidence which can be confirmed (checked). Pseudoscience often looks like science but instead relies on personal stories which cannot be confirmed. We therefore have to be careful not to believe everything we hear or read. So let’s approach the topic of aliens from a scientific (rather than a pseudoscientific) point of view. An astronomer named Frank Drake came up with a famous equation called the Drake equation, which helps us determine how many advance
