nebulosity

The hot central star can be seen faintly near the center of the nebulosity.

From Textbooks ● Oct. 13, 2016

Later, the stars wander out of their nursery to seek their fortunes in the Milky Way, stellar adolescents still surrounded by tuffs of glowing nebulosity, residues still gravitationally attached of their amniotic gas.

From "Cosmos" by Carl Sagan

His mental nebulosity is resolving itself into something concrete, which shall weigh upon him for a while and propel him in the direction of Atheism and Demagogy.

From The Book of Khalid by Ameen Fares Rihani

His sonnet on Ben Nevis, 1818, is also an utterance of scepticism—speaking of heaven and hell as misty surmises, and of “the world of thought and mental might” as a realm of nebulosity.

From Life of John Keats by William Michael Rossetti

Speculated concerning the Milky Way, the nebulosity of stars, the origin and growth of solar systems.

From Pioneers of Science by Sir Oliver Lodge

These have no tails, and are probably mere nebulosities, without solid nuclei.

From A Popular History of Astronomy During the Nineteenth Century Fourth Edition by Agnes M. (Agnes Mary) Clerke

October we mean to spend at Paris, before we return to the nebulosities of London.

From Personal Recollections, from Early Life to Old Age, of Mary Somerville by Mary Somerville

The top arc of its prostrate base reached a thousand feet or more up the precipitous wall; above it all was hidden in sparkling nebulosities that were like still clouds of greenly glimmering fire-flies.

From The Metal Monster by Abraham Merritt

They are transparent nebulosities, of extreme lightness, without mass nor density.

From Astronomy for Amateurs by Frances A. (Frances Alice) Welby

On the Tennysonian reader pur sang Browning's work was pretty sure to make the impression so frankly described by Frederick Tennyson to his brother, of "Chinese puzzles, trackless labyrinths, unapproachable nebulosities."

From Robert Browning by C. H. (Charles Harold) Herford