Asteroid's path altered in NASA's first test of planetary defense system

NB, not quite a dupe.

There was some discussion earlier but below the 20 comments threshold usually applied, here: <https://news.ycombinator.com/item?id=33167184>

Yes, there have been multiple submissions of similar articles. That's fine by HN guidelines: <https://news.ycombinator.com/newsguidelines.html>

(Noting because I'd first thought this was a dupe, and having checked, it isn't.)