The phrase "floating orb" refers to a round object that is floating or levitating in the air without any visible support or attachment. Full definition
Humorously, one such bunny appears here — staring at a nearby floating orb of gold, its simply rendered body conveying an amusing posture and sentiment. (artspace.com)
And I'm saying, honestly, you can't be an inhabitant of this fine floating orb for very long before the baggage starts to accumulate. (remodelaholic.com)
That same sign showed a picture of Earth and a mysterious floating orb nearby the planet. (heavy.com)