Are there more stars in the universe than grains of sand on Earth?

From ABC Science Online, 19 August 2015: It may hurt your brain to think about it, but it seems that the answer is likely to be yes, or at least the numbers are roughly in the same ballpark. Astronomers actually set out to answer this question about a decade ago. It’s a tricky problem to Continue reading Are there more stars in the universe than grains of sand on Earth?

Oldest known star discovered

From ABC Science News Online, 10 February 2014: Astronomers have discovered the oldest known star, born in the fiery wake of a first generation supernova after the Big Bang. The star, with the catchy name SMSS J031300.362670839.3, came to the attention of an international team of astronomers because of its unique chemical fingerprint showing it Continue reading Oldest known star discovered