Where are the Transformers and Decepticons?

I was randomly surfing the web the other day and learned Steven Spielberg is directing a live-action movie about the Transformers for a 2007 release. I loved playing with the toys and may just have to buy the new ones to certainly be released with the movie. While that's interesting enough, I read a capsule about the 1986 animated Transformers movie that went something like this:

The movie is set in 2005, twenty years after the TV series, and chronicles the efforts of the heroic Autobots to defend their homeworld of Cybertron from the evil Decepticons and Unicron, a huge robotic creature who eats planets such as Cybertron.

So it's 2005 and I ask, where are the robots? With all of our astronomical (gotta love double meanings) ability, why haven't our scientists seen Optimus Prime, Astrotrain, or Galvatron? Who knew 2005 was once thought of as a futuristic time for any planet in space?