A star originates from a large cloud of gas

The temperature in the cloud is low enough for the synthesis of molecules.

Its main sequence begins in the upper left corner of the HR Diagram.

Stars of a much higher mass weigh more that 10 solar masses

Are nearly 100 times brighter than our Sun.

Will use up its fuel more quickly.

It will only be on the main sequence for around 100 million years.

In their cores, heavier stars generate enough heat and pressure to spark other stages of fusion.

This process generates energy and causes the star's outer layers to expand.

The outer gaseous envelope will blast away, releasing some of its mass.

The star will begin its two billion-year trip from the main sequence when it becomes a red giant.

It's classification moves to the upper right portion of the HR Diagram

It grows to a size of 10 to 100 times its previous mass.

A flare causes the outer layers to expand due to increased hydrogen fusion in a shell enclosing a non-burning helium core.

Because of its gravitational force, its core will continue to collapse into itself, causing it to pressurize while remaining hot, where it transitions again.

will grow and cool without becoming brighter

The outer gaseous envelope will blast away, releasing more of its mass.

During its transition to Red Supergiant it blows more mass.

Nuclear fusion events continue at the core of a supergiant, transforming helium into heavier elements like carbon and, later, even heavier elements where fusion processes take place in various layers surrounding the core.

They can be hundreds to thousands of times more significant in radius than the Sun and emit tens of thousands to millions of times more energy.

They are among the largest and brightest stars in the universe.

They are seen from great distances in space.

Supergiants are frequently red or orange in appearance due to their lower surface temperatures.

They are categorized as red supergiants at their coolest and most enormous.

These stars undergo many phases of nuclear fusion, producing heavier elements in their cores.

The collapse of the core causes a quick implosion followed by a powerful explosion where elements get thrown out into space.

The inner core may collapse into a neutron star or black hole, but the outer layers blast into space.

A supernova's brightness rises so swiftly that it can be seen across the galaxy.

When the core can no longer sustain the fusing of heavier elements, it collapses under the pull of gravity.