stars in the spectral classes M, L, T or Y (the last 3 are subclass brown dwarf classifications) will last the longest because of how slowly they burn fuel. red dwarves in class M are likely to burn for 100 Billion years, ten times longer than our star. and brown dwarves, which actually do produce some light, will burn longer than that, perhaps 1 TRILLION years or longer!
The lifetime of a star is determined by its mass because more massive stars burn through their fuel faster due to higher core temperatures and pressures. Higher-mass stars undergo fusion at a quicker rate, leading to a shorter lifespan compared to lower-mass stars. Conversely, lower-mass stars burn their fuel more slowly, allowing them to exist for billions of years.
Among the types of stars, red dwarfs have the longest lifespans, often lasting tens to hundreds of billions of years. Sun-like stars have lifespans of about 10 billion years, while giant stars typically live only a few million years due to their rapid consumption of nuclear fuel. Supernovae are not stars themselves but rather explosive events marking the death of massive stars, which means they do not have a lifespan in the same sense. Therefore, red dwarfs are the longest-lived, followed by sun-like stars, with giant stars having significantly shorter lifespans.
The highest-mass stars have the shortest lifetimes; a star 60 times as massive as the Sun is predicted to have a lifetime of only a few million years, and extremely massive stars like R136a1 have even shorter lifetimes. In contrast, small, cool, dim stars can burn for a very long time; the smallest red dwarf stars may last for a trillion years before burning out.
The stars were known in ancient times, long before Galileo's lifetime.
The lower right part of the main sequence in the Hertzsprung-Russell diagram contains the stars that took the longest to reach the main sequence. These stars are low mass and cool, so they undergo a longer contraction phase before they start fusing hydrogen in their cores and settle onto the main sequence.
Red dwarves.
The stars that have the longest lifetimes are the smaller, cooler stars - red dwarfs. They are just about massive enough to sustain nuclear fusion of hydrogen fuel, but consume fuel at a very low rate. They could last for hundreds of billions of years before they exhaust their fuel.
The cells that last the longest are nerve cells, they last a lifetime
When a star is at the end of its lifetime its mass increases.
A lifetime!
Suns
Live Mas that is your hint to who I am
The approximate lifetime of a small star, like a red dwarf, can range from tens of billions to over a hundred billion years. These stars burn their hydrogen fuel slowly, allowing them to exist for much longer than larger stars, which have shorter lifespans due to their more rapid fusion processes. In contrast, larger stars may only last a few million to a few billion years before exhausting their fuel. Overall, small stars are among the longest-lived objects in the universe.
The Galapagos giant tortoise can live for over 200 years. It is the animal with the longest lifespan that has been classified.
Main sequence
The Longest Day
When a star is at the end of its lifetime its mass increases.