I've been in the space and aerospace business for a long time, and I've never heard the term "retro-rockets." Every program I've worked called them TVC or TVCS for "thrust vector control system."
In the past and I think also currently, the people stongly supporting space mining and investing in it are looking at the very small amount of material they could bring back as an interesting novelty and a very small side benefit to their main objective. Sales pitches to potential investors...
I know that a RTG is not a nuclear reactor, but it is commonly called that in the press, and we who worked with them would also sometimes call it that, even though we knew better.
I worked in the lifting, handling, and installation into the spavecraft, so I was not one of the guys who got to...
I remember that launch. The roads were packed with thousands of protesters objecting to the nuclear payload. That craft has a nuclear reactor onboard for power. Too far away from the sun to use solar power.