The Bright and Cool stars in M33: Using AGB stars to probe the age and metallicity of galaxies
Today’s paper explores a novel method to use intermediate-age AGB stars to probe the metallicity and age othe Triangulum galaxy M33.
Today’s paper explores a novel method to use intermediate-age AGB stars to probe the metallicity and age othe Triangulum galaxy M33.
Do you feel older? How does it show in your body? Stars carry their own clocks within them too. See how we can better measure their Uranium as it slowly ticks away.
The oldest objects in the universe weigh in on the heated debate over the “Hubble Tension,” disagreements on the expansion rate of the universe.
In today’s Astrophysical Classic, we hark back to 1987 and the introduction of a new method determining the age of the universe through the use of white dwarf stars.
It took homo sapiens hundreds of thousands of years on the planet to understand a fundamental, simple-sounding, question: how old is the Earth? The answer to this question has gone down in the history books as one of the most important geophysical and astrophysical discoveries of the past century. This paper, by Clair Patterson in 1956, is credited with providing the first accurate, measured age of the Earth.