[Chris]

I guess it depends on the intention behind re-opening the thread. If it can be done within a valid, up to date context then that would be fair enough. Bumping dormant threads for no reason however is likely just to annoy people and I tend to close threads when that happens as it just leads to confusion (people don't tend to look at the date on a thread or post).

Dave's bumping of the explosions in the sky thread was on the edge. I understand why it was bumped but perhaps a little more context than just "wow, this really happened" could have been used in the actual act of bumping it.

I believe old threads in the general discussion forum are deleted after a certain amount of time, but not in the other forums.