BEYOND
An Introduction to Antimatter:
All matter was formed during the big bang. Baryonic matter, which is what humans, Earth and everything you see on a regular basis is made. Anti-baryonic matter is incredibly rare in our universe and can only be found in high-energy particle collision sectors or artificially created. However, due to an unexplained reason, the amount of baryonic matter dominates the amount of anti-baryonic matter. As far as modern astrophysicists know, the baryogenesis, the process of which matter is made, was asymmetric. It formed more baryonic matter than anti-baryonic. This has been proven through the collision of a proton and antiproton, which caused a rare byproduct to be made.
A star dies in a flash of brilliance, a light that can outshine entire galaxies and radiate more energy than our sun will in its entire lifetime. A star's explosive death is called a supernova, when the dying star sheds its outer layers and leaves behind an extremely dense core.
Gravity presses down on the core so tightly that protons and electrons combine to form neutrons, hence the name "neutron star." After being birthed from the supernova, neutron stars are packed into a 20 kilometer diameter, so dense that even a single teaspoon of the star weighs a billion tons. The gravity on this star is 2 billion times stronger than the gravity on Earth, powerful enough to significantly bend radiation from the star, a process called gravitational lensing.