Janus Sunaj

I like this "hexatable", which I modified because it originally had H next to He, F, and O, which seemed (very) wrong to me; so I re-positioned it adjacent to He and Li, which seems much more reasonable.

Phi for All is right about using the type of electrical generator that is optimum for the locale. Steam (more properly, a Rankine heat engine with water as the working fluid, with either nuclear or thermosolar heat) may not be optimum for a Moon base, because of the temperature ranges there – even though it's a pretty good choice here on Earth, being non-toxic, non-flammable, and low-corrosivity compared to other working fluids – mercury, pentane, CFC, etcetera – and having a fairly low molar heat of vaporisation, for good efficiency. For a Moon base, a Stirling (or Ericsson) heat engine with hydrogen working fluid may be a better choice for nuclear or thermosolar heat, and maybe better than photovoltaic for large-scale needs.

You are to use either a pressure gauge (atmospheric?) or else an IR camera, but not both? The details are unclear, sorry.

Consider it an energy problem (not circular motion) with two situations: (1) 10kg mass (not weight) at the bottom of its arc, with some nonzero velocity (2) 10kg mass at the top of its arc, velocity zero With no information about friction, assume none; therefore the sum of kinetic energy (KE) plus potential energy (PE) is constant through the arc, so KE in situation (1) must equal the increase in PE from situation (1) to situation (2).

Items for consideration when comparing transport to Mercury with that to Mars: • Hohmann (minimum-energy) transfer time Earth-to-Mercury (105 days) is much less than Earth-to-Mars (259 days) • Escape velocity from Mercury (4.3km/s) is a bit less than that from Mars (5.0km/s) • Significant atmospheric aerobraking for Mars landing, none for Mercury