UPDATE:  SOLVED by Amresh at 12:25 CDT

Cogitate!  It’s Saturday, and we get to play.  You’re getting very good at solving these riddles, so just to increase the confusion the subject is slightly more obscure than usual, but you have certainly heard about it.

You ready?  Okay… jumping right in:

Recreated Firestone radio dial - image by wrnewton, PhotoBucket

Today’s riddle answer is a thing — which happened.

The year this happened was also the year a very special PET was introduced to the world.

This thing/happening is closely linked to the constellation Sagittarius.

Chi Sagittarii star group in Sagittarius - Benjamin Crowell/En Wiki user Fashionslide

Its properties have been heatedly debated.

To our knowledge, this thing has never been repeated.

Something about this is forbidden – and that’s extremely important to consider.

Forbidden - PhotoBucket wiifan420 some rights reserved

It is, in and of itself, a riddle.

One possible solution to the “real-life” aspect of today’s riddle would strongly impact every person on Earth.

Dr. Seth Shostak could solve today’s riddle in 60 seconds flat, and not just because he’s so smart!

Cartesian graph - PhotoBucket image by muiriath

Okay… have I puzzled you?  I’m sure a few people will find this riddle easy (I’m talking to you, Rob and Roger), but I had fun with its creation.  That’s the whole point of these little brain-busters; right?  I hope you have as much fun with its solution.

Enjoy.