Solar energy costs

In a previous post I talked about the advantages of solar electricity compared to other renewable source of electricity. In this post I’ll move away from my normal scientific topics and discuss the costs of small scale solar energy and how it compares with other renewables. Whats is 'the LCOE'? When comparing the relative costs… Continue reading Solar energy costs

Advantages of solar energy

As shown in the graph and table below, most renewable electricity is generated by hydroelectric power. Solar energy lies in third place behind wind. Electricity generated from renewable sources. From Our world in data (2018). The ‘Others’ category includes biofuels  (e.g. burning wood, animal and agricultural wastes), geothermal energy and wave/tidal power) Despite only being… Continue reading Advantages of solar energy

Galileo and the telescope

Telescopes are instruments which use multiple lenses to produce magnified images of distant objects. It is unclear who invented the first telescope: lenses had been widely used in Europe to correct poor eyesight since the fourteenth century and I expect that, over time, the telescope was actually invented many times by different individuals, who discovered… Continue reading Galileo and the telescope

196-an unsolved problem

For my latest post I'll move away from my usual topics of astronomy and space travel and I'll talk about an interesting unsolved problem in mathematics which is: 'Is the number 196 a Lychrel number?'. What is a Lychrel number? There is a simple mathematical operator called reverse and add where you take a number… Continue reading 196-an unsolved problem

Satellite navigation – the next ten years

Satellite navigation is such a vital part of day-to-day life that other countries of the world are planning to build up their own network of navigation satellites and move away from total reliance on the American system, GPS. America As mentioned in my previous post, the GPS system is operated and funded by the US government. The first… Continue reading Satellite navigation – the next ten years

GPS

The Global Positioning System, better known as GPS, has come to affect countless aspects of our daily lives, from directing our holiday aeroplanes to enabling us to drive round an unfamiliar city without any map other than the one on our mobile phone.  At the risk of making myself sound like a scary stalker, I… Continue reading GPS

Twilight

Watching the Sun set below the horizon and the sky gradually get darker and darker is an almost magical experience.  Twilight is that period of the day when the sky is not completely dark, and it can be used to describe the period either just after sunset, or just before sunrise.  It is valued by photographers because of… Continue reading Twilight