Discovered this large, papery ball under the trees in my yard. It’s light as a feather and completely hollow inside. Is it an egg?

species of gall wasp, belonging to the Cynipidae family. These wasps are incredibly small, often no larger than 1/8 of an inch. Despite their size, they have a significant impact on the trees they inhabit.
The female wasp uses her ovipositor to inject her eggs into the developing tissue of an oak tree. The chemical interactions between the wasp’s eggs and the tree induce the formation of the gall. This process is a remarkable example of complex ecological relationships, where the behavior of a tiny insect can lead to