If an exact copy of our sun were made, it would have the same initial properties and characteristics as our current sun. This would include its mass, composition, and energy output. However, the lifespan of a star is determined by its mass.
Our sun is classified as a main-sequence star, specifically a G-type main-sequence star. The lifespan of a main-sequence star is primarily determined by its mass. Higher-mass stars have shorter lifespans, while lower-mass stars have longer lifespans.
Our sun has a mass of about 1.989 × 10^30 kilograms. Its estimated lifespan is around 10 billion years. Throughout this time, it has been burning hydrogen in its core through the process of nuclear fusion, converting hydrogen into helium and releasing a tremendous amount of energy.
If an exact copy of our sun were made with the same mass, it would also have a similar lifespan. However, it's worth noting that the lifespan of a star can be influenced by other factors such as metallicity (the abundance of elements heavier than helium), rotation rate, and magnetic activity. These factors can affect a star's evolution and potentially alter its lifespan to some extent.
In summary, an exact copy of our sun, with the same mass and initial conditions, would likely have a very similar lifespan to our current sun, which is approximately 10 billion years.