The observations that led to the new image are part of a larger effort to help astronomers measure the ages, shapes and structures of globular clusters located near the center of our Milky Way galaxy. Gorgeous Hubble Space Telescope image shows turquoise waves rippling through Milky Way companion Hubble Space Telescope captures trippy 'mirror image' view of distant galaxy It has red hues caused by glowing, hydrocarbon rich dust and is composed of two rings, an inner and an outer.- Star cluster glitters in new Hubble Space Telescope photo
Srikanth also discussed the Cartwheel Galaxy, which is thought to have formed from a high-speed collision between two separate galaxies about 400 million years ago. Nebulae may be created by the death of stars or by the condensation of interstellar gas, and often become nurseries for new generations of stars. He illustrated the point with various images of the Crab Nebula, which is the remains of a supernova, and discussed the varieties of nebulae and their descriptive names, including the Lemon Slice, Monkey Head and Stingray nebulae. Srikanth emphasized that the JWST’s images are computer-derived amalgamations of different wavelengths invisible to humans that aim to show as much information as possible. Other images that Shrikanth discussed included shots of a young star that showed up in shades of orange and blue when color-corrected, and of a globular cluster, a dense mass of tightly packed stars of comparable age, in the Milky Way. Stars appear to have spikes while galaxies do not due to gaseous diffusion in the latter. If a star is surrounded by four diffraction spikes in an image, the shot came from Hubble if it shows six diffraction spikes, the image came from the JWST. Srikanth shared a tip for determining whether an image was taken by Hubble or by the JWST. As the JWST has a much larger mirror for detecting light, its version of the deep field was significantly sharper with more detail and clarity. Srikanth compared shots of the cluster taken by both telescopes. One of Hubble’s more famous images was a deep field view of the SMACS 0723 galaxy cluster later retaken by the JWST. As an infrared imager, its photographs must be processed in order to render them visible to the human eye. JWST was designed to look at very distant stars and galaxies at near- and mid-infrared wavelengths and have the ability to perform detailed spectroscopy in order to determine such stellar and planetary characteristics as temperature, mass and age. Srikanth stated that the telescope is currently working better than expected and will likely be able to operate for 25 years or more.
The James Webb Space Telescope is Hubble’s successor, launched into a halo orbit around the L2 Lagrange point in 2021, where it is shielded from the sun and gravitationally-balanced to minimize the need for repositioning. NASA has conducted six maintenance missions to the telescope, which is accessible for repairs due to its low orbit. Although designed for an operational life of 15 years, it continues to operate after more than three decades. It images in the visible and near-infrared spectra. The Hubble Space Telescope was launched into low earth orbit in 1990. Srikanth discussed the universe and our planet’s place in it as visualized through images from both the Hubble and James Webb space telescopes, which he described as the two most important tools for viewing the universe. Shri Srikanth, Ph.D., a frequent speaker and presenter at Yavapai College’s Osher Lifelong Learning Institute, shared a presentation on “The Magnificent Universe as Revealed by the Hubble and James Webb Space Telescopes ” during OLLI’s April 28 Brown Bag program.
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