Gravitational waves are not directly visible to the human eye or any optical instruments. They are a phenomenon of spacetime curvature caused by accelerating masses, and they propagate as ripples in the fabric of spacetime itself.
When two massive objects, such as pulsars, merge, they can emit intense gravitational waves. These gravitational waves can be detected and measured using specialized instruments called gravitational wave detectors, such as the Laser Interferometer Gravitational-Wave Observatory (LIGO) and Virgo.
These detectors work by measuring the extremely tiny changes in the lengths of two perpendicular arms caused by passing gravitational waves. The interference pattern created by these length changes provides evidence of the existence of gravitational waves.
Although we cannot directly visualize gravitational waves, their detection and measurement have provided significant scientific insights into the nature of astrophysical events and the behavior of space and time. The detection of gravitational waves from merging black holes and neutron stars has contributed to our understanding of the universe's most extreme phenomena.
However, it's worth noting that the merger of two pulsars is a relatively rare event, and specific circumstances and observations would be required to detect the corresponding gravitational waves. The current gravitational wave detectors are sensitive to a specific frequency range and require certain conditions for successful detection.