The two examples of the eagle and the cloud are sufficient to prove that flying and floating can be made possible through adjustments of the air. The planets, in a similar way, are floating because material nature adjusts the air: Revision history
Diff selection: Mark the radio buttons of the revisions to compare and hit enter or the button at the bottom.
Legend: (cur) = difference with latest revision, (prev) = difference with preceding revision, m = minor edit.