How old is the sun?

Answer 1

4.6 billion is the age of the earth. I think the sun would have to be mostly created in order for the gravity to be correct to form Earth. It has to be older than 4.6 billion. But just by a bit.

Answer 2

The age of the universe is 13 billion years and the sun is approx 4.57 billion years old.

The latest technique used to measure this is nucleocosmochronology, also known as cosmochronology: a relatively new technique used to determine timescales for astrophysical objects and events.

Previously the way we estimated the age of the Sun was the age of meteoric rocks found on earth.

Nucleocosmochronology employs the abundances of radioactive nuclides in a way that is very similar to the use of Carbon-14 in dating archeological samples, save that the elements measured are typically uranium and thorium.

Nucleocosmochronology has already been successfully employed to determine the age of the Sun (4.57±0.02 Ga, where Ga stands for giga-year, i.e., 10^9 years) and of the Galactic thin disk (8.3±1.8 Ga), among others.

It has also been used to estimate the age of the Milky Way itself, as exemplified by recent study of the halo star CS31082-001. Limiting factors in its precision are the quality of observations of faint stars, and perhaps more importantly, the uncertainty of the primordial abundances of r-process elements.

THE R-PROCESS

The R-process (R for rapid) is a neutron capture process for radioactive elements which occurs in high neutron density, high temperature conditions. Contrast with P- and S-processes. In the R-process nuclei are bombarded with a large neutron flux to form highly unstable neutron rich nuclei which very rapidly decay to form stable neutron rich nuclei.

The site of the R-process is believed to be iron-core collapse supernovae, which provide the necessary physical conditions for the R-process. However, the abundance of R-process elements requires that either only a small fraction of supernova return R-process elements to the outside or that each supernova only contributes a very small amount of R-process elements.

Due to the much higher neutron flux in this process (on the order of 10^22 neutrons per cm^2 per second), the rate of isotopic formation is much faster than the beta decays which follow).

Answer 3

About 5 billion years. Half way through its lifetime.

Answer 4

5 billion years old.

Answer 5

It's about halfway through it's entire life, so it should be about 4.5 billion years old.

Answer 6

4.5 or 5 billion years

Answer 7

About 4.5-billion years old. It's got about that same period to go before it dies.

Answer 8

Old

Answer 9

Either 4.6 billion years or 6,010 years, take your pick.

Answer 10

4.57 billion years old