15:40, 12 May 2012Geoffrey.landistalkcontribs uploaded
File:LED bulbs 2012.jpg(Some of the LED lightbulbs available to the consumer as screw-in replacements for standard incandescent bulbs. Photo by Geoffrey A. Landis, uploaded by the photographer. From left to right: Ecosmart A19 bulb, GE "Energysmart," EvoLux, ZetaLux-2 Pro, ...)
15:02, 4 September 2008Geoffrey.landistalkcontribs uploaded a new version of
File:PV 1980-2007.jpg(Graph of world shipments of photovoltaic arrays, in peak MW, as a function of year from 1980 to 2007. Graph by Geoffrey A. Landis, using data from various sources. Uploaded by the author.)
22:00, 21 August 2008Geoffrey.landistalkcontribs uploaded
File:PV 1980-2007.jpg(Graph of World production of photovoltaic arrays, in peak Megawatts (MW(p)) from 1980 to 2007 (log scale). The line shows the exponential fit to the curve for the most recent ten years, indicating a doubling of production every two years. Image by [[Ge)
04:11, 6 March 2008Geoffrey.landistalkcontribs uploaded
File:Venus airplane.JPG(Concept for a solar-powered aircraft to explore the atmosphere of Venus. Image by Les Bossinas, NASA Glenn Research Center. See Geoffrey A. Landis, Anthony Colozza, and Christopher M. LaMarre, ''Atmospheric Flight on Venus,'' AIAA 40th Aerospace Science)
15:48, 24 January 2008Geoffrey.landistalkcontribs uploaded a new version of
File:Mars mission 1963.jpg(Artist's conception of the Mars Excursion Module (MEM) proposed in a NASA Study in 1963. From "Summary Presentation: Study of a Manned Mars Excursion Module," Franklin Dixon, in ''Proceeding of the Symposium on Manned Planetary Missions: 1963/1964 Status')
15:37, 24 January 2008Geoffrey.landistalkcontribs uploaded
File:Mars mission 1963.jpg(Artist's conception of the Mars Excursion Module (MEM) proposed in a NASA Study in 1963. From "Summary Presentation: Study of a Manned Mars Excursion Module," Franklin Dixon, in ''Proceeding of the Symposium on Manned Planetary Missions: 1963/1964 Status)