NASA’s James Webb photo explained: How to distinguish between stars and galaxies in this image of the deep universe


News from James Webb, NASA releases its first photo: it took 72 exposures over 32 hours of exposure time to produce it.

NASA released a stunning photograph of the universe on Thursday, one of the deepest images of infinite space ever taken. The photograph which shows a view of stars and galaxies was released days before the mass release of the first “science-grade” images of the universe taken by NASA’s flagship James Webb Space Telescope. The high-resolution photos will be released on July 12, for which the US space agency has planned an elaborate event. The “teaser” image was not taken by the massively powerful main imaging instruments aboard the expensive James Webb Space Telescope. It was taken by Webb’s Fine Guidance Sensor (FGS), whose main job is to find and lock onto the target. very difficult for an untrained person to distinguish between stars and galaxies in the first James Webb Space Telescope ever released, but NASA explained the photo in detail.

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The fine guidance sensor is fully capable of capturing images, but was designed to facilitate precise scientific measurements and imaging with precise pointing, NASA said in a statement. The agency said images captured by this sensor are almost always discarded because the telescope has limited communication bandwidth. However, during the stability test in May, the science team decided they could save the image because there was data transfer bandwidth available.

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The image was taken during a thermal stability test in mid-May. NASA said it had no plans to take the image. They were testing the telescope’s ability to stay locked on a target. But it could still take on the image of a vast territory.

It took 72 exposures over a 32-hour period of exposure time to produce one of the deepest images of the universe ever taken. The agency, however, said that when the sensor’s aperture is open, it cannot use color filters, making it untenable for scientific exploration.

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NASA said bright stars can be distinguished by their six long, well-defined diffraction spikes – an effect due to Webb’s six-sided mirror segments. Beyond the stars, galaxies fill almost the entire background, he added.

NASA explained that the bright star on the right edge is 2MASS 16235798+2826079. Apart from a few stars, faint objects are thousands of galaxies, some even in other universes.

To find out how to watch the July 12 event in India, CLICK HERE



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