IV. On nebulous stars, properly so called

  title={IV. On nebulous stars, properly so called},
  author={William Sir Herschel},
  journal={Philosophical Transactions of the Royal Society of London},
  pages={71 - 88}
  • W. Herschel
  • Physics
  • Philosophical Transactions of the Royal Society of London
In one of my late examinations of a space in the heavens, which I had not reviewed before, I discovered a star of about the 8th magnitude, surrounded with a faintly luminous atmosphere, of a considerable extent. 

William Herschel and The Planetary Nebulae

At the close of the paper I give the location of half-a-dozen planetary nebulae, as I call them. These are celestial bodies of which as yet we have no clear idea and which are perhaps of a type quite

Nebulae, Star Clusters and the Milky Way: From Galileo to William Herschel

Among the stars listed by Ptolemy in his catalogue in the Almagest are some seven that he describes as nepheloeides, ‘cloud-like’, from nephele, cloud (in Latin, nebula). Their diffuse shape

The M51 mystery: Lord Rosse, Robinson, South and the discovery of spiral structure in 1845

In April 1845 Lord Rosse discovered the spiral structure of M51 with his 72-inch reflector at Birr Castle. Already in March the new telescope had been pointed at the object in Canes Venatici, later

William Herschel and the Nebulae, Part 2: 1785–1818

When William Herschel sent to the Royal Society his 1784 paper on the construction of the heavens, he was still of the opinion that there were true nebulae to be found alongside those that were

William Herschel's Early Investigations of Nebulae: A Reassessment

137. Humason, op. cit. (ref. 126). 138. E. Hubble to W. de Sitter, 23 September 1931 (Huntington Library). Of course by 1931 de Sitter's model B had dropped completely from favour and Hubble could

John Michell and Black Holes

La priorite des travaux de M. et de Herscel sur la capture de la lumiere par gravite par rapport a ceux de Laplace.

Star formation in galaxies and star clusters

This thesis is devoted to star formation from galaxy-scales (≈ 10 000 pc) to sub-star cluster-scales (≈ 0.1 pc). I develop and test a new method to derive star formation histories of Galaxies from

Lunatick Visions: Prophecy, Signs and Scientific Knowledge in 1790s London

Cet article s'interesse au combat lie a l'interpretation de certains des signes qui ont prolifere a la fin du regne de George III et la relation de ces interpretations aux notions de science


  • M. Snell
  • Engineering
    The Dreaming Mind and the End of the Ming World
  • 1997
Absolute altitude. The actual distance an object is above the ground. Advancing blade. The blade moving in the same direction as the helicopter. In helicopters that have counterclockwise main rotor


Of the many problems involved in discussions of acceptability and justification I wish to consider in this paper what types of sentences can be used in order to justify a given claim or theory in