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The galaxy G2 is a background object, rather than a member of the galaxy group.
The source at the bottom of the image is a background object not contained in the HD 189733 system.
In a paper in Nature, Nicastro et al.6 report the detection of the X-ray absorption signatures of baryons in the spectra of a bright background object.
However, often the intervening lens is only strong enough to slightly stretch the background object; this is known as weak lensing.
Like any any digital camera, what zone you choose to select focus from determines whether your autofocus will converge on a foreground or background object.
Visual impressions of distance and speed of UFOs are also highly unreliable because they are based on an assumed size and are often made against a blank sky with no background object (clouds, mountains, etc). to set a maximum distance.
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Redesigning of background objects is also possible for aesthetic reasons.
Morphological operations are applied to the enhanced image to remove most background objects.
In these conditions, cameras need a fast exposure time and small aperture, making it impossible to capture faint background objects.
Note that, although the aberrations are depth and wavelength dependent, both the foreground and background objects can recovered simultaneously to extend the depth of field.
They are known among photojournalists as "the story telling lens" for their ability to capture a broad vista while keeping both foreground and background objects in focus.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com