Gravity waves.
In physics, gravitational waves are ripples in the curvature of spacetime that propagate as a wave, travelling outward from the source. A gravitational-wave detector is any device designed to measure gravitational waves, minute distortions of spacetime that are predicted by Einstein's theory of general relativity. Gravity waves are generated by extreme cosmic events such as colliding stars, black holes, and supernova explosions, which carry vast amounts of energy at the speed of light.
An illustration of the gravity waves produced by two stars orbiting each other.
Gravitational Radiation
Gravitational Radiation is to gravity what light is to electromagnetism. It is produced when massive bodies accelerate. You can accelerate any body so as to produce such radiation, but due to the feeble strength of gravity, it is entirely undetectable except when produced by intense astrophysical sources such as supernovae, collisions of black holes, etc. These are quite far from us, typically, but they are so intense that they dwarf all possible laboratory sources of such radiation.
Gravitational waves have a polarization pattern that causes objects to expand in one direction, while contracting in the perpendicular direction. That is, they have spin two. This is because gravity waves are fluctuations in the tensorial metric of space-time.
Gravity waves were predicted by Einstein in 1916 but have yet to be measured on earth despite many attempts. There is currently a proposal for an internationally funded (in excess of $1B) gravity wave detection project.
The pallets mark the remnants of someone's gravity wave detection experiment:
The pallets are in New Jersey.
Princeton University is in New Jersey.
Einstein had an office and taught at Princeton.
Einstein predicted the existence of gravity waves.
This entire thread is a spacetime distortion, and it has spin too.
It all fits like a glove.
Where the heck is Steve? I'll post Euler's Identity, the equivalent of his Bat Signal in an attempt to contact him:
