What is this 2012 hoax about???? has NASA detected any object called Nibiru out there in space?

there have been numerous people predicting the end of the world in 2012. i know, some ppl think that there is NO Nibiru out there in space but in www.unexplainedmysteries.com/ i read that there is some kind of huge device floating in space towards the earth. and tht is nibiru. WEb boT is an integrated system which can take a look at the future. it says that the big device will encounter earth on July 23, 2012. it is actually one third the size of earth. it is surely from aliens. an alien invasion. nibiru has one ability: invisibility. that is why we cannot see anything in space. it pes by unnoticed. even highpowered telescopes and probes cannot detect it either except the webbot can. it is in an extreme gaseous state. it can p through any obstacle known in the universe. i am not very sure about all of this but it would be highly appreciated if u share your opinion with me. THANKSX!!!!!!!!!!!!!!!!!!!!!! :D =D ;)