The source of Earth's solar power: The Sun. Solar energy is radiant light and heat from the Sun that is harnessed using a range of ever-evolving technologies such as solar heating, photovoltaics, solar thermal energy, solar architecture, molten salt power plants and artificial photosynthesis.
1 The average annual temperature in Vienna, Austria is a little cool at 9.8 degrees Celsius (49.7 degrees Fahrenheit). 2  Mean monthly temperatures vary by 21.5 C (38.7 F) which is a below moderate range.3  The range/ variation of diurnal mean temperatures is 7.3 C (13.2 F).verage Temperatures in Vienna, Austria. 1  The average annual temperature in Vienna, Austria is a little cool at 9.8 degrees Celsius (49.7 degrees Fahrenheit).
Geography and population. 1  Austria covers an area of 83,878 square kilometres with a population of 8,773,686 residents (as of 1 January 2017), including 1,342,758 foreign citizens (15.3% of total population). In 2016, an average of 1,898 million people with migration background lived in Austria, that is 21.6% of the entire population.