nebulosity

[neb-yuh-los-i-tee]
noun, plural nebulosities.
1.
nebulous or nebular matter.
2.
a nebulous form, shape, or mass.
3.
the state or condition of being nebulous.

Origin:
1755–65; < Late Latin nebulōsitās. See nebulose, -ity

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World English Dictionary
nebulosity (ˌnɛbjʊˈlɒsɪtɪ)
 
n , pl -ties
1.  the state or quality of being nebulous
2.  astronomy a nebula

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
Not having seen the object, my guess is that your observant student has caught a bit of nebulosity or a unique formation of stars.
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