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" ... Firstly, in the last four years the efficiency of the Polo has not changed much at all. My 2016 model has listed CO2 emissions of 107g/km against 105g/km for a 2020 model, so there’s nothing in it. The new car is lighter and has a smaller engine, but they’ve made it bigger and there’s a turbo-charger. In contrast, my older 2013 version emitted 136g/km, so more of a CO2 saving was made then by including the BlueMotion features that are now standard. ... "
" ... Purple light is also emitted from excited copper and manganese atoms. Copper is found in many minerals that occur in deposits large enough to mine. These include azurite, malachite (both copper carbonate hydroxide minerals), chalcocite (a copper-sulfide), acanthite (a copper-silver sulfide), chalcopyrite and bornite. Most copper comes from chalcopyrite, a copper-iron sulfide mineral. Manganese easily reacts with water and air. On Earth, manganese is never found as a free metal, but it is found in a number of minerals. The most important of these minerals is pyrolusite, a mineral consisting essentially of manganese-dioxide and the most important ore of manganese. ... "
" ... The light you see, when you look out at the stars and galaxies that fill the Universe, isn't the same as the light that gets emitted by those very stars and galaxies. Before it can arrive at our eyes, that emitted light has to travel large distances — from a few light-years for the nearest stars to billions of light-years for the most distant galaxies — and contend with every obstacle the Universe puts in its way. So how do we know what the light we see actually tells us? That's what Peter Ehret wants to know, writing in to ask: ... "
" ... When we look out at the Universe, we’re not seeing objects as they are today, but rather as they were when the light that reaches us today was emitted. The closest star to us, Proxima Centauri, is located 4.24 light-years away, and therefore appears to us as it was 4.24 years ago: when its light was emitted. For stars located even farther away, however, we also have to take into account the expansion of the Universe when we look back at them. And the stars we’re seeing were also formed some time ago: Proxima Centauri was born 4.85 billion years ago, making it even older than our Sun How do we put this together to determine the age of stars located all across the Universe? That’s what Sharika Hafeez wants to know, asking: ... "
" ... “The BMW X5, Volvo XC60 and Mitsubishi Outlander (PHEV versions) emitted 28 to 89% more CO2 than advertised when tested by Emissions Analytics on a fully charged battery in optimal conditions. On an empty battery, they emitted 3 to 8 times more than official values. When driven in battery-charging mode, which could become more common as motorists charge up ahead of using electric mode in low-emissions zones, the PHEVs emitted 3 to 12 times more,” T&E said in the report. ... "