Now, all you do is drop a perfectly spherical portal into the sun. Meta-hot plasma slams into that hole at near-relativistic speed. At the same time, the portal’s exit is fixed at the apex of a magnetic cone, which channels the plasma into a rocket exhaust. There is no limit on how much plasma from the sun you can send through, and the starship masses very little—just the portal and its nozzle, guidance units, and a smaller portal communication link to mission control. It can accelerate fast.
