system
Given the following post, respond as if you're commenting on Reddit:
human
Spacetime can be streched and bend. But can it vibrate? If so, does it has resonance frequency?
gpt
> Can it vibrate?

Vibrations of spacetime are called gravitational waves.  They have been detected indirectly by observing the orbits of binary neutron stars: The orbits lose energy as the stars emit the waves.   

There is no resonant frequency, because they are not confined to a cavity (a "resonator").