How solar energy got so cheap, and why it's not everywhere (yet)
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YouTubeDW Planet A
How solar energy got so cheap, and why it's not everywhere (yet)
A lot speaks for solar energy. It's clean, renewable – and now even cheaper than energy from fossil fuels like coal or natural gas. Sounds pretty great, right? But it only makes up a tiny bit of global electricity production. Why don't we use a lot more of it yet? We're destroying our environment at an alarming rate. But it doesn't need to be ...
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Orbits and Kepler's Laws - NASA Science
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nasa.gov
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