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  4. Edwin Powell Hubble
  5. The great spirals, with their enormous radial velocities...

The great spirals, with their enormous radial velocities and insensible proper motions, apparently lie outside our Solar system.

Edwin Powell Hubble
Lying, Velocity, Astronomy
Edwin Powell Hubble (1920). “Photographic Investigations of Faint Nebulae ...”
The great spirals, with their enormous radial velocities and insensible proper motions, apparently lie outside our Solar system.