The staff of Keck Observatory on the hexagonal outline of the Keck Primary mirror, May 14, 2015
The staff of Keck Observatory on the outline of the Keck Primary mirror, May 14, 2015
W. M. Keck Observatory Staff
When you want to see the stars, find someplace dark
The staff of Keck Observatory on the hexagonal outline of the Keck Primary mirror, May 14, 2015
The staff of Keck Observatory on the outline of the Keck Primary mirror, May 14, 2015