When people such as soldiers march across a bridge, they must break step, or the regular vibration could break up the bridge. Someone’s high-pitched note could shatter a wine glass.
Why? Because everything has a resonance frequency, unique to each object or molecule or quark or photon or ocean or planet, that can make it vibrate. Size is no inhibitor. For instance, the resonance of the moon’s gravity causes Earth’s ocean’s tides to rise and fall.
Now, there is such a “thing” as gravitational resonance, and that is the core of the Hot Marble science. The premise is that by resonating the space-time between planets, people might step through from one planet to another. Materials such as weapons or trade goods could also be transported through the resonated nexus.
The marble stores the coordinates of the places in space/time. A small singularity’s event horizon powers the resonance, and a computer system based on ultrasound “tunes” the resonance. That system allows connections. Be sure to wear a space suit if you are connecting to an airless asteroid, and take a space ship or large truck for carrying big stuff.
I hope this small discussion of the science behind my science fiction series, A SOUL’S WARFARE, interests you. Comments would be most welcome.