Why were the answers to this closed question deleted?
I was browsing the answers to a Q migrated from SE:Space Exploration when suddenly they were all marked as deleted and the Q was closed. Refreshing the page, the answers were all gone. I'm not asking why the Q was closed, because that's obvious, but why were the answers deleted? They contained some genuinely interesting info. Are answers normally deleted on migrated Q's that are closed? Did the answering users delete their posts simultaneously? What happened?