Milky Way Over Abandoned Kilns

What's that below the Milky Way? Historic kilns. Built in the 1870s in rural
Nevada, USA to process local wood into charcoal, the kilns were soon abandon
due to a town fire and flooding, but remain in good condition even today.
The above panorama is a digital conglomerate of five separate images taken
in early June from the same location. Visible above the unusual kilns is a colorful
star field, highlighted by the central band of our Milky Way Galaxy appearing
along a diagonal toward the lower right. Many famous sites in our Galaxy are
visible, including the Pipe Nebula and the Dark River to Antares, seen to the right
of the Milky Way. The origin of the green mist on the lower left, however, is
currently unexplained.