Spiral nebulas

Using a telescope with a 72" wide mirror, Parsons observed spiral structures in certain nebulas provided a new understanding of galactic formations and laid the groundwork for future astronomical discoveries.
 William Parsons Ireland 1845 Spiral nebulas

Using a telescope with a 72" wide mirror, Parsons observed spiral structures in certain nebulas provided a new understanding of galactic formations and laid the groundwork for future astronomical discoveries.