Hello how may I help you? What is the longest thing ever recorded? Sorry, but your request is too vague, what type of thing? Whatever has been measured and established as the longest thing ever. The biggest known thing in the universe is the Hercules Corona Borealis Great Wall Is that for size or length? both I can give you the estimated length of this. Oh, so it is not the Earth itself, that is pretty long? It takes 10 billion light years to pass through the object. But, that is not World record. That would be a Universe record? I am confused. It could be but I'm pretty sure if there was one there would be a Universe record too.