EEF © With geektimes, discuss a new type of engine:

by zorge_van_daar
I’ll tell you one clever way to store energy – in uranium. The power of the submarine reactor is 60 MW. If the power of this device is scaled linearly, it is 75 N of power. Traction of the ion engine - 20-250 mH. Yes, the reactor and fuel weigh a lot, but in sum, I think it would be a breakthrough.

by Amarao:
How do you dispose of 60 MW of heat in a vacuum?

by misato:
We are going to place a giant animated billboard that will show advertising towards Earth.