Should we take this seriously? The videos look like something from a science fiction story. But some say we should take aliens more seriously.
‘Alien corpses’ presented to Mexican congress
Fact or fiction: Ufologist Jaime Maussan has made alien claims before. Glossary
UFOs - Unidentified Flying Objects
Proof - Something that shows something else is true.
Universe - Everything. Including all of time and space and its contents.
Nasa - The National Aeronautics and Space Administration, responsible for the US space programme.