Another questions is what happens to the speeding cluster if is was flung out by a bigger galaxy. One would assume the the dark matter that originally present in the cluster would not take the same track. Without the supporting dark matter the radial velocities are too great for the outer stars of the cluster to continue orbiting the system. One would think that there should be trail of stars left behind. Could be a great way to investigate dark matter interaction with galaxies.

This carpet would could be set up in areas of coastal erosion. The energy taken from the wave is not available to destroy the coast so it could be a win win for certain area of the world.

The engine probably uses shock waves to produce the compression necessary for combustion. As such it would have a high minimum RPM. And due to material strength and the high heat inside the engine the maximum RPM probably is close to the minimum RPM. This engine would need to run a generator to maintain its efficiency. At this high RPM it would run a generator that could be very efficient, maybe up to 95% and could be made very small, maybe incorporated into the engine itself.

How does this compare with microwave power transfer? Is there an advantage to using lasers?

B&N buying Fat Brain was a loss for me me too. I stopped trading with Barnes and Noble for many years because of it.

The larger questions is how can such a massive planet end up in such a elliptic orbit. Assuming the gas giant was made from the swirling dust cloud around the star to start with then it would be in a almost circular orbit. What could have happened to change the orbit as much as this?