I'm not sure if another game killed Halo so much as it imploded on itself, sadly. Maybe whatever game made the open world blueprint popular? But honestly, Guardians wasn't great either and it wasn't open world.
I think it's more the culture of gaming now a days than anything. Everyone likes the free to play mulitplayer shit, or did and companies won't let it go. A solid campaign goes to the wayside when they have to concentrate on the multiplayer to rake in the $$$. Halo had the best of both worlds, and now it has nothing, it really lost it's spark.
That said I still enjoyed Guardians more than Infinite, just needed more Chief. Infinite went a little too off the Halo rails.
But I guess that's how most things end up in the end. Hold onto the great memories.
It is pretty crazy people were able to figure that all out and we are able obtain crazy detailed pictures without radiation.
No I haven't seen it! Hoping to see a controlled quench someday but also hoping to avoid needing to use it in any emergency situations; it'll have to be a damn near life/death situation to hit that button. Very costly decision. I guess there's also a dwindling supply of helium in the world so that could get interesting as time goes on.