How could anyone know?
Light can split.
How do we know what a star is made of?
The ground can shake.
How do we know what is under our feet?
A footprint.
How do we know dinosaurs walked here?
The floor feels still.
How do we know Earth is moving?
A star can dim.
How do we find a planet we cannot see?
They look as if they fit.
Is looking like a match enough?