...hardly distinguishable from a faint star-disk. "3. Most of these nebula; have a spiral structure. . . . "While I must leave to others an estimate of the importance...once suggests itself that the solar system has been evolvecT f rom a spiral nebula, while the photographs show that the spiral nebula is not, as a rule,...

...hardly distinguishable from a faint star disk. " 3. Most of these nebulas have a spiral structure. . . . While I must leave to others an estimate of the importance...nebula, while the photographs show that the spiral is not, as a rule, characterized by the simplicity attributed to the contracting mass in the nebular...

...significance of Professor KEELER'S work cannot be better stated than in his own words. He says: — "While I must leave to others an estimate of the importance...the form normally assumed by a contracting nebulous ma>s, the idea at once suggests itself that the solar system has been evolved from a spiral nebula,...

...hardly distinguishable from a faint star disk. " 3. Most of these nebulas have a spiral structure. . . . While I must leave to others an estimate of the importance...questions concerning the cosmogony. If, for example, the spinil is the form normally assumed by a contracting nebulous mass, the idea at once suggests itself...

...hardly distinguishable from a faint star disk. " 3. Most of these nebulas have a spiral structure. . . . While I must leave to others an estimate of the importance...conclusions, it seems to me that they have a very clirect bearing on many, if not all, questions concerning the cosmogony. If, for example, the spiral...

...attention to the remarkable fact that "Most of these nebulae have a spiral structure," and stated that "While I must leave to others an estimate of the importance...nebula, while the photographs show that the spiral is not, as a rule, characterized by the simplicity attributed to the contracting mass in the nebular...

...1900, James Keeler gave an extended discussion of his photographs of spiral nebulae. He concluded: The idea at once suggests itself that the solar system...nebula, while the photographs show that the spiral nebular is not, as a rule, characterized by the simplicity attributed to the contracting mass in the...

...mysterious objects? Many, including Keeler, thought they were planetary systems in the making. If, he wrote, 'the spiral is the form normally assumed by a contracting...solar system has been evolved from a spiral nebula'. William Huggins, writing in 1889, had taken a similar view. Of a photograph of the Andromeda Nebula,...