a decade of sun

The "decades of sun" is not a commonly used term or concept, so I'll provide you with some information based on the assumption that you are referring to the lifespan of the sun.

The sun is a main-sequence star, meaning it is in the middle of its life cycle, currently estimated to be about 4.6 billion years old. Scientists believe that the sun will continue to burn for another approximately 5 billion years before it exhausts its nuclear fuel and undergoes significant changes.

Over the course of the next few billion years, the sun will gradually increase in size and luminosity. This process is known as stellar evolution, and during this phase, the sun will enter the red giant phase. As the sun exhausts its hydrogen fuel in its core, it will start burning helium, causing it to expand and engulf the inner planets, including Earth.

Eventually, the sun will shed its outer layers, forming a planetary nebula, and the remaining core will collapse to form a dense white dwarf. The white dwarf will continue to cool and fade over trillions of years, eventually becoming a cold, dark remnant known as a black dwarf.

It's important to note that the timescales involved in stellar evolution are immense compared to human lifespans and recorded history. The concept of "decades of sun" would represent a minuscule fraction of the sun's overall lifespan and wouldn't capture any significant changes or events