Solar-powered space flight

3. Power required to reach earth orbit ignoring atmospheric drag

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3a.   Assuming that we launch vertically upwards, with constant exhaust velocity

3b.   Assuming that we launch vertically upwards, but with variable exhaust velocity

3c.    Assuming that we launch approximately ‘horizontally’, with variable exhaust velocity

3d.   Assuming that we launch approximately ‘horizontally’, with capped variable exhaust velocity

3e.   Corresponding figures for various other bodies in the solar system

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