Once every 25, 800 years, the sun lines up with the centre of our Milky Way galaxy on a winter solstice, the sun's lowest point in the horizon.
每过25 800年，在冬至日，太阳都将与银河系的中心重合，太阳的最低点在地平线上。
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A novel approach that USES both heat and light from the sun to make electricity could potentially double the output of solar panels (a New Way to use the sun's Energy).
Snow and ice normally reflects much of the sun's energy — up to 90 percent — back the way it came. But a layer of soot on top of the ice will absorb the sunlight, warm the ice beneath, and melt it.