So, you are the one responsible for all those UFO sightings!
LOL.....yes we did make one of those too.
We put about thirty lighting units (matchbook sized wet battery and a flashlight bulb) into the interior of a big balloon, then inflated it with helium. We gave it enough lift to get about 400 feet altitude, then let it go.
Just for fun I painted a skull and crossbones on it too.
The first Death Star!