dustofdeath t1_iyexm6x wrote

Hydrogen is 2.8x more energy dense than kerosene for the same unit of mass. But needs four times more volume.

Meaning you actually need less fuel - so it almost negates the increased volume issue. Especially if the efficiency of fuel to thrust is better than fossil fuels.

I believe AirBus is already planning a commercial plane by 2035. So there likely have been developments on how to properly store liquid hydrogen (that eliminates the volume issue). The ZEROe.


dustofdeath t1_iujzruc wrote

Universe is young, human existence is insignificantly short in the cosmic timescale and universe is huge.

Even if advanced life was common, it's too easy to miss. There may be none in this galaxy, but many in trillions of others. We may be a million years too late or a billion years too early.

You are looking for a specific water molecule in the sea.