General relativity, formulated by Albert Einstein, is the theory that describes the behavior of matter and energy in the presence of strong gravitational fields, making it essential for understanding objects like black holes and neutron stars.

The event horizon is the boundary around a black hole where the gravitational pull is so strong that nothing, not even light, can escape.

The accretion disk is the region around a black hole where matter and energy are accelerated and heated to extremely high temperatures due to gravitational forces.

The singularity is the hypothetical point at the center of a black hole where all matter is compressed to an infinitely small volume.

Gravitational waves are ripples in spacetime caused by the acceleration of massive objects, and their detection by LIGO confirmed a key prediction of general relativity.

PSR J1748-2446ad, also known as the 'Black Widow Pulsar,' is the neutron star with the fastest known rotation rate, completing 716 revolutions per second.

Roche lobe overflow occurs when a star transfers mass to its companion star through gravitational interaction, often leading to the formation of an accretion disk around the neutron star.

X-ray binaries are binary star systems containing a neutron star or black hole that accretes matter from its companion star, resulting in the emission of X-rays.

Neutron star mergers are catastrophic events that occur when two neutron stars collide, releasing enormous amounts of energy and potentially forming heavier elements.

Pulsars are neutron stars that emit beams of radio waves due to their rapid rotation and strong magnetic fields.

A bow shock is a shock wave created when a neutron star's magnetic field interacts with the interstellar medium, forming a distinctive bow-shaped structure.

Pulsar wind nebulae are regions of high-energy particles and radiation created by the interaction of a pulsar's magnetic field with the surrounding interstellar medium.

Magnetars are neutron stars with extremely strong magnetic fields, which can cause them to emit X-rays and gamma rays.

Pulsars are neutron stars that emit beams of radio waves due to their rapid rotation and strong magnetic fields.

Magnetars are neutron stars with extremely strong magnetic fields, which can cause them to emit X-rays.