On June 20, 2022, the James Webb Space Telescope spent just over one hour staring at Messier 92 (M92), a globular cluster 27,000 light-years away in the Milky Way halo. The observation – among the very first science observations undertaken by Webb – is part of Early Release Science (ERS) program 133
; and Andy Dolphin from Raytheon Technologies to find out more about Webb’s observations of M92 and how the team is using the data to help other astronomers.
This image is a composite of four exposures using four different filters: F090W is shown in blue; F150W in cyan; F277W in yellow; and F444W in red. The image is about 5 arcminutes across. Credit: Image Processing: NASA, ESA, CSA, Alyssa Pagan : This particular program is focused on resolved stellar populations. These are large groups of stars like M92 that are very nearby – close enough that Webb can single out the individual stars in the system.
What are the characteristics of a globular cluster that make it useful for studying how stars evolve?One of the main things is that the bulk of the stars in M92 would have formed at roughly the same time and with roughly the same mix of elements, but with a wide range of masses. So we can get a really good survey of this particular population of stars.Also, since the stars all belong to the same object , we know they are all about the same distance away from us.
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