The Nublons just paid you a visit and upon leaving they left something really stellar behind:

Since June 10 to June 17, 2013, when you harvest, you’ll find Nublonian Batteries on your farm, which you can use to power this galactic gizmo.

For those of you who missed the Nublons’ last visit and who don’t know what the Recycl-O-Mat does, here’s a rundown for you:

Just fill leftover plants and animals in the large bin. If you don’t have enough “fuel” in the barn, you can also run the Recycl-O-Mat on Nublonite Dust and Nublonite Splinters which you can get in the shop. Fire up the the Recycl-O-Mat and watch your space gadget go, go, go! Then marvel at what it whips up for you!

Oh, and by the way, the Nublons were kind enough this time to increase the chances of winning the jackpot.
So give it a go!

Have fun looking for Nublonian Batteries.
Here’s hoping the Recycl-O-Mat creates some cool, new things for you.

The Event will start on Thursday, 13th of June "around" 2pm CEST

The FAQ will be updated with the new rewards - tomorrow around 11am CEST

Source: Official Farmerama Forums.