Science, Space and Technology News 2024
This image of NGC 1651, a globular cluster in the Large Magellanic Cloud, exemplifies how celestial objects of varying sizes appear in Hubble’s images due to its fixed field of view and the object’s distance from Earth Credit: ESA/Hubble & NASA, L. Girardi, F. Niederhofer
Hubble captures varied cosmic scales, from the close globular cluster NGC 1651 to distant galaxies, using its fixed observational scope and mosaicing when necessary.A notable feature of this image is that the globular cluster almost fills the entire image, even though globular clusters are only about 10 to 300 light-years in diameter .
For example, the ultraviolet/visible light channel of Hubble’s Wide Field Camera 3 , the channel and instrument that were used to collect the data used in this image, has a field of view roughly one-twelfth the diameter of the Moon as seen from Earth. Whenever WFC3 makes an observation, that is the size of the region of sky that it can observe.The reason that Hubble can observe objects of such wildly different sizes is two-fold.
In fact, there’s a distant spiral galaxy lurking in this image, directly left of the cluster — though undoubtedly much larger than this star cluster, it appears small enough here to blend in with foreground stars! Secondly, multiple images spanning different parts of the sky can be mosaiced together to create single images of objects that are too big for Hubble’s field of view.
This is a very complex task and is not typically done for Pictures of the Week, but it has been done for some of Hubble’s mostSciTechDaily: Home of the best science and technology news since 1998. Keep up with the latest scitech news via email or social media.A new species and genus of fairy lantern, tiny glass-like white plants that feed on fungi, has been discovered in Japan.
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