seeder, on 16 January 2013 - 11:02 PM, said:
I loved this bit: "The star, HD 140283 is 13.2 billion years old, and could be much older"
ah right, so we're not really sure then?
You might not be, but the astronomers are.
It is good scientific practice to show the level of uncertainty in a result, it's called experimental error. The astronomers estimate this star to be 13.9 billion years old ±700 million years (source:
Nature). Thus they are sure that this star is at least 13.2 billion years old.
Sean93, on 16 January 2013 - 11:14 PM, said:
Of course given the distance, they could have been wiped out by now if their sun supernovaed.
The star is only 190 light years away, so it was still there as of 2 centuries ago. Also the fact it is an old star excludes it from going supernova. Stars which become supernovae are very large and use up their fuel rapidly. They live fast and die young.