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Steam catapults are on the top of the ship, and the reactors are near the bottom. You need an extensive network of pipes to fill the reservoir tanks at each catapult. The steam needs to maintain temperature the entire way. There is a reason we run power lines across the country, and not steam lines.
My smart phone has had an IPv6 address since I bought it a couple of years ago. Cell companies had to go that way to get enough addresses to handle the move to smartphones.
All the nuts and bolts in my car and bike are metric. The bike is made in the good old US of A. Everyone knows what a 2-liter soda is, why can't they figure out what a 2-liter bottle of milk is? We are partially converted. We use 35mm film (old people, at least) and 9mm ammo. Anyone who has been in the military has done everything in metric, it's not that difficult. It is hard to change everything. Even countries you changed decades ago still use old units. England and Ireland are full of examples of that. The most noticeable change will be road signs. It's not that hard to learn that 60 mph is 100 kph. We will have to watch out during the transition. A Canadian airliner ran out of fuel half way due to bad conversions from gallons/pounds to liter/kilograms during their changeover.
A comet has a core, a coma and a tail. When the comet hits the Moon, the core may leave a crater. The coma and tail still impact, they are made of physical objects, but they are just gas and dust. The authors are saying the swirl patterns are caused by the impact of this gas and dust. It is not ejected from the crater.