Note 63 — Chapter XVII · NEBULÆ AND CLUSTERS OF STARS.
Reading edition
Chambers says only four examples are known, but this is erroneous, as Lord Rosse’s telescope has added five ring-nebulæ to the four previously catalogued.
Reading edition
Chambers says only four examples are known, but this is erroneous, as Lord Rosse’s telescope has added five ring-nebulæ to the four previously catalogued.