Solar is one to watch, with dropping costs and potential to keep Europe's lights on if a Mediterranean grid can be built to match the planned North Sea one.

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And, you can watch a video of Solar Impulse taking off on its North American journey and hear Borschberg talk about learning to fly it after the break.

ENGADGET

In fact, I'm seeing that this discussion that we're talking about - the international discussion on planetary characteristics - will have wonderful opportunities for the public to, you know, watch and to learn about what we know about our own solar system, what we know about planetary bodies within the solar system.

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And new software, plus the ability to vary the projected sizes and brightnesses of planets and moons, makes it possible to simulate the sky from anywhere in the solar system: to see earthrise from Mars, for example, or to watch Jupiter's moons rise and set from a vantage point just above the gas giant's cloud-tops.

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The watch's screen will be made of plastic and it will run on solar energy, making it less likely to malfunction or run out of power in a tense scenario.

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