Although sunlight is free and abundant, solar electricity is still usually more expensive to produce than large-scale mechanically generated power due to the cost of the panels.

Although neon is a very common element in the universe and solar system ( it is fifth in cosmic abundance after hydrogen, helium, oxygen and carbon ), it is very rare on Earth.

Although individual experiments, such as the set of solar neutrino experiments, are consistent with non-oscillatory mechanisms of neutrino flavor conversion, taken altogether, neutrino experiments imply the existence of neutrino oscillations.

Although the planet Earth is currently the only known body within the solar system to support life, current evidence suggests that in the distant past the planet Mars possessed bodies of liquid water on the surface.

Although verified at the time by a committee of the National Geographic Society, this claim has since been undermined by the 1996 revelation that Byrd's long-hidden diary's solar sextant data ( which the NGS never checked ) consistently contradict his June 1926 report's parallel data by over.

Although stellar parameters can be expressed in SI units or CGS units, it is often most convenient to express mass, luminosity, and radii in solar units, based on the characteristics of the Sun:

Although Super-K had beaten SNO to the punch, having published evidence for neutrino oscillation as early as 1998, the Super-K results were not conclusive and did not specifically deal with solar neutrinos.

Although helium is present only in low concentrations on the Moon, where it is deposited into regolith by the solar wind, an estimated million tons of He-3 exists over all.

Although white dwarfs are known with estimated masses as low as 0. 17 and as high as 1. 33 solar masses, the mass distribution is strongly peaked at 0. 6 solar mass, and the majority lie between 0. 5 to 0. 7 solar mass.

Although predicted scattering rates for WIMPs from nuclei are significant for large detector target masses, prediction that halo WIMPs may, as they pass through the Sun, interact with solar protons and helium nuclei.

Although solar wind particles have rest mass and photons do not, sunlight has thousands of times more momentum than the solar wind.

Although they were designated officially to study just the planetary systems of Jupiter and Saturn, the space probes were able to continue their mission into the outer solar system, and they are expected to push through the heliosheath in deep space.

Although they originate from beyond our solar system, they have set up an outpost on Pluto ( known as Yuggoth in the mythos ) and sometimes visit Earth to mine for minerals and other natural resources.

Although a ZEB uses multiple passive solar building design concepts, a ZEB is usually not purely passive, having active mechanical renewable energy generation systems such as: wind turbine, photovoltaics, micro hydro, geothermal, and other emerging alternative energy sources.

Although these risks are small, monitoring of solar proton events by satellite instrumentation allows the occasional exposure to be monitored and evaluated, and eventually the flight paths and altitudes adjusted in order to lower the absorbed dose of the flight crews.

Although the date of Eid ul-Fitr is always the same in the Islamic calendar, the date in the Gregorian calendar falls approximately 11 days earlier each successive year, since the Islamic calendar is lunar and the Gregorian calendar is solar.

Although this is an effective method, it causes the thermal component to under-perform compared to a solar thermal collector.

Although their exteriors are subjected to intense solar radiation that can alter their chemistry, their interiors contain pristine material essentially untouched since the planetesimal was formed.

Although solar power generation is still not economical in much of the United States, recent developments might make it more affordable.

Although the team used a gallium nitride semiconductor in its " proof of concept " device, it claims that the use of gallium arsenide can increase the device's efficiency to 55 – 60 percent, nearly triple that of existing systems, which is only 12 – 17 percent more than existing 43 percent multi-junction solar cells.

Although often dismissed as a lightweight forerunner of Charles Darwin's The Origin of Species, Chambers ' book was in reality a programme for the unification of science which aimed to show that Laplace's nebular hypothesis for the origin of the solar system and Lamarck's theory of species transformation were both instances ( in Lewes ' phrase ) of ' one magnificent generalization of progressive development.

Although elves could be considered to be beautiful and potentially helpful beings in some sections of English-speaking society throughout its history, Old English evidence also attests to alignments of elves with demons, as for example in line 112 of Beowulf.

Although crossovers typically occur between homologous regions of matching chromosomes, similarities in sequence can result in mismatched alignments.

Although Thom found really clear evidence for only sixteen subdivisions of the solar year ( of 21 or 22 days ) in the standing stone alignments, there were some indications of a further subdivision into 32 parts of 10 or 11 days.

Although all the main structures are long gone, some artifacts such as the road grid, concrete slab foundations, manholes, cisterns, several rock alignments and dozens of small ponds remain today.

Although the fire zone can be run out of many fronts and alignments, the main points are the weakside defensive end or end man on the line of scrimmage away from the blitz dropping off into coverage, and pressure coming from the opposite side of the field.

Although he questions the extent and nature of the alleged revival of religion and the alleged increase in conformity, and thinks that `` hedonistic '' present-time orientation does not have the meaning usually attributed to it, he does conclude that Americans increasingly enjoy leisure without guilt, do not stress achievement so much as formerly, are more accepting of group harmony as a goal, more tolerant of diversity and aware of other cultures.

Although the false glamour surrounding bourbon or other whisky commercials is possibly no more fatuous than the pseudo-sophistication with which TV soft-drinks are downed or toothpaste applied, there is a sad difference between enticing a viewer into sipping Oopsie-Cola and gulling him into downing bourbon.

Although the United States and the U.S.S.R. have been arguing whether there shall be four, five or six top assistants, the most important element in the situation is not the number of deputies but the manner in which these deputies are to do their work.

Although today's trucks are as fast as passenger cars, a truck driver has to be a sensible person and guard against hogging the road.

Although they are forbidden to sit with the customers, the dancers are sometimes proffered drinks, and most of them can bolt one down in mid-shimmy.

Although there are many sound reasons for adopting uniform and coordinated fiscal years in Rhode Island, there are also certain difficulties encountered.

Although the site may not contain the features themselves, there are often opportunities to include them as additional interest to the site.

Although the play does show a certain structural amateurishness ( there are eleven acts varying in length from twenty-five seconds to an hour and a half ), the statement it makes concerning the ceaseless yearning and searching of youth is profound and worthy of our attention.

Although there is no question but that the process of washing fabrics involves a number of phenomena which are related together in an extremely complicated way and that these phenomena and their interrelations are not well understood at the present, this section attempts to present briefly an up-to-date picture of the physical chemistry of washing either fabrics or hard surfaces.

Although the standard deviation values on which spread of the lines is based are relatively larger for those centers which begin to ossify early ( Table 1 ), there are considerable differences in this value between centers having the closely timed Onsets.

Although in both emotions sympathetic symptoms are present, different autonomic-somatic patterns underlie aggression and anxiety, respectively, as indicated by the rate of the excretion of the catecholamines, the state of the muscle tone, and the Mecholyl test.

Although we are still far from a complete understanding of these problems, as a first approximation, it is suggested that alterations in the hypothalamic balance with consequent changes in the hypothalamic-cortical discharges account for major changes in behavior seen in various moods and states of emotions in man and beast under physiological circumstances, in experimental and clinical neurosis, and as the result of psychopharmacological agents.

Although the inner functions of religion are not of direct significance in social organization, they have important indirect consequences.

Although the Brandywine population is still predominantly rural, `` there are indications of a consistent and a statistically significant trend away from the older and relatively isolated rural communities.

Although science has given us more effective materials, preparations from anise, castorbean, colchicum, nux vomica, mustard, fennel, and stramonium are familiar to many for the relief of human ailments.

Although the Administration's program cut crop acreage to the lowest point since 1934, farmers, with the help of extra fertilizer and good weather, are getting such high yields per acre that many are being forced to buy new harvesting machines.

Although progress has been made in America's system of libraries it still falls short of what is required if we are to maintain the standards that are needed for an informed America.

Although the theological forms of the past continue to exist in a way they do not in a more secularized situation, the striking thing is the rapidity with which they are being reduced to a marginal existence.

Although there are landscapes in the show ( one of the strongest is a vista of `` Gloucester Harbor '' in 1915 ), the human element was the compelling factor in Sloan's art.