if you mean what is the source of radiation in space the he answer is it comes from stars in most of their lifespan
How massive it is and its luminosity (the mass and luminosity correlate with each other with most stars, mainly the main sequence stars). The more mass a star has, the shorter its lifespan.
the brightness of a star is dependant on its temperature and radius. however, while a star is burning hydrogen into helium (which all stars do for most of their lifespan and it's usually this kind of object we mean when we say "star") a correlation does exist between the mass of the star and its luminosity (brightness)
The smaller a star the longer it lives. Smaller stars can live up to 200billion years, while a supergiant only lives about 10 billion years. Cooler stars live longer because they don't burn as much energy as a hotter star, while the larger the star, the shorter its lifespan
Only if you "larger" you mean "more massive". The size (diameter) of a star may change quite a lot over its lifetime.
YES!
maximum 20 years
STufF
The maximum recorded lifespan for humans is around 122 years. While there is ongoing research on extending lifespan through advancements in medicine and technology, 122 years remains the longest confirmed human lifespan to date.
The Mayfly has a lifespan that varies from a minimum of thirty minutes to a maximum of twenty four hours.
Lifespan
the maximum number of years a species can live
The average lifespan of a bat is four to five years. The maximum lifespan that is known is up to 11 years.
Millions Of Years
The maximum known lifespan is 8 years.
The maximum is three.
Its lifespan and its final form when it dies. Heavier stars have shorter lifespans and more spectacular transformations at death.