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A black hole is a region in space where the gravitational pull is so intense that nothing, not even light, can escape. It forms from the remnants of a massive star that has undergone a supernova.

A supernova is a powerful stellar explosion resulting from the death of a massive star. It occurs when a star has exhausted its nuclear fuel and its core collapses, causing a shock wave that ejects the outer layers.

A white dwarf is the remnant of a low to medium mass star after shedding its outer layers. It no longer undergoes fusion reactions and slowly cools over time, packing a lot of mass into a small volume.

A nebula is a giant cloud of dust and gas in space. Nebulas are the birthplaces of stars. The gravity can cause the nebula to collapse, forming clumps called protostars.

A red giant is a late stage in a star's life cycle; it occurs when the hydrogen fuel in the core is exhausted, and the outer layers expand as the core contracts. The star's surface cools and reddens.

A neutron star is formed from the collapsed core of a massive star after a supernova explosion. It is incredibly dense, so much so that a sugar-cube-sized amount would weigh billions of tons on Earth.