Interesting fact of the day: A gravitational wave, having energy, also generates its own gravitational field in addition to itself. Though this field is insanely weak.
Note this is not the same as saying a gravitational field has its own gravitational field. It is only the wave that has energy, and thus its own field. A gravitational wave only occurs when an object with a gravitational field accelerates (and orbiting another object counts as acceleration).
Well its a hard thing to test experimentally.
But the reason here is just energy, gravitational waves have energy, so they must have their own gravitational field.
@freemo @icedquinn So this has the possibility of being useful in the future. That's pretty cool. I wonder if energy shields would benefit from amplification of this.