P

pH Aac2

There are problems with interstellar ramjets: when putting actual numbers in equation (8.5), and even assuming V of the order of the speed of light c, the scooping area to collect 1 GW is of order of 1012m2, or a square 103 x 103 km. In fact, our Sun is in a region of our Galaxy where pH may be even lower than assumed

Fuels (ratios)

Reaction products

Energy density, J/kg E/m — ac2

Converted mass fraction a — Dm/m

Chemical:

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