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Gravitational waves are ripples in the fabric of space-time caused by massive objects moving with extreme velocity. When a pair of neutron stars in a binary system orbit each other, they do so at incredible speeds. This rapid motion creates gravitational waves, which travel outwards at the speed of light.
Over time, these waves carry away energy and angular momentum from the system.
This loss of energy causes the stars to spiral closer together, ultimately leading to a collision and merger. Researchers use detectors like LIGO and Virgo to observe and study gravitational waves, providing insights into the dynamics of stellar phenomena.
The understanding of gravitational waves has revolutionized our knowledge of events like neutron star collisions, allowing scientists to observe cosmic events that were invisible before this technology existed.

Binary star systems consist of two stars orbiting a common center of mass. These systems are prevalent throughout the universe and are crucial for studying stellar evolution. In the context of neutron stars, binary systems can lead to astronomical events of great importance.
When both stars in a binary system are neutron stars, their gravitational attraction pulls them into tight, fast orbits around each other. As they lose energy through gravitational waves, the orbits decay, drawing the stars inexorably closer. Eventually, this results in the spectacular phenomenon of a neutron star collision.
Binary systems are investigated not only for their individual characteristics but also for their role in larger-scale cosmic events. Studying them provides insight into processes like the formation of elements heavier than iron in the universe during such collisions.

Angular momentum is a critical concept in understanding the mechanics of celestial bodies. It refers to the quantity of rotation an object has, which is dependent on its mass, velocity, and distance from the center of rotation. In neutron star binary systems, angular momentum keeps the stars in stable orbits for significant time periods.
However, as gravitational waves are emitted, they remove angular momentum from the system. This reduction causes the orbital radius to decrease as the system's total energy is minimized, pulling the neutron stars closer over time.
In essence, a decrease in angular momentum can be seen as the driving force that leads to neutron stars colliding and merging. Without the removal of angular momentum through processes like gravitational wave emission, the stars would continue orbiting indefinitely without merging.