An international team, including astronomers from Keele University, has performed a unique cosmic test to measure the mass of an ancient star, which will help them learn more about the history of our galaxy.



Summary

An international team, including Keele University astronomers, conducted a novel cosmic test to determine the mass of a distant, ancient star. By analyzing the star’s gravitational effects on light from a background star, they directly measured its mass. This technique, known as gravitational microlensing, offers a unique window into the properties of stars that formed early in the Milky Way’s history. Understanding the mass of these ancient stars provides crucial insights into the galaxy’s formation and evolution, shedding light on the composition and behavior of stars in the early universe.

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