A younger globular cluster – Astronomy Now

The Giant Magellanic Cloud (LMC), which is the closest galaxy to our Milky Manner at about 159,000 mild years, is dwelling to about 60 globular clusters. Pictured right here is certainly one of these nice balls of stars, specifically NGC 2210, which shines within the night time sky at magnitude +11 within the Southern Hemisphere constellation of Doradus. Imaged by the Hubble House Telescope, it’s full of lots of of hundreds of stars.

NGC 2210 is a little bit of an outlier. In 2017 astronomers led by Rachel Wagner-Kaiser of the College of Florida measured the ages of six globular clusters within the LMC and located their imply age to be over 13 billion years previous, inside simply 200 to 400 million years of the start of our personal Milky Manner Galaxy’s most historic globular clusters. The inference is that the LMC’s globular clusters shaped similtaneously the Milky Manner’s globular clusters, but again then the 2 galaxies had been presumably far aside – the LMC is considered passing near the Milky Manner for the primary time. Is there one thing elementary that brought on globular clusters in two galaxies, and maybe all around the Universe, to type on the similar time?

Not all of them shaped on the similar time. NGC 2210 is definitely youthful, at 11.6 billion years previous. Why NGC 2210 shaped a bit later than the others is only one extra thriller to be solved.

Picture: ESA/Hubble/NASA/A. Sarajedini/F. Niederhofer.