The Pontic Rhododendron Size:17" x 22" The fairly regular spacing of

The fairly regular spacing of the blue star-forming knots fits with what is seen in the spiral arms of other galaxies and is predictable based on instabilities in the gas contained within the arm

Part of the Kegler Collection

looking south

according to a bulletin from the Volcanism Blog

United States Geological Survey

The Pontic Rhododendron Size:17" x 22" The fairly regular spacing ofRobert John Thornton, Pontic Rhododendron from the The Temple of Flora folio published in London between 1777 and 1807 as a Aquatint and mezzotint with stipple engravings and completed by hand. Original work printed at 17 x 13 in. (438 x 343 mm.)