[buildbot]

The rust does stand out as kind odd, not many aerospace materials rust???

How fast would you have to spin a gear ring to say, launch it on a ballistic trajectory and have it go supersonic? Maybe a factory somewhere had a _really_ catastrophic accident?

[petee]

Things tend to burn up in re-entry if they're not designed for it, and this wasn't designed for it. Many metals oxidize when super heated

[Danmctree]

There have been a bunch of very powerful non-nuclear explosions. Perhaps a part of an exploding ship such as in the halifax explosion or the Princess Irene?

[buildsjets]

Where is the rest of the exploded ship, in that case?

[jamieplex]

Maybe that was the "rumbling" they all heard! lol