Originally Posted by karlhead
Over the years I have often thought about it. I was heading more or less southeast and it appeared that what whatever it was was heading more southerly. It was in late March so it possibly could have been migrating birds but the "circle" of nothing stayed spherical the whole time. And my radar reflector was on top of the main mast not off of the port quarter.
Not having been there, my guess would be an escaped party balloon or tied together collection of balloons.
Knowing what I do about physics, space travel, and computing, I'd ask why a species would ever bother to go to the trouble to actually explore with spacecraft, when they could likely more easily simulate the parameters of their evolving universe, and "explore" the simulation.