Did you actually read the article? The stone/object they filmed was within the atmosphere, thus going around terminal velocity, depending a little on the size of it, which varies a little on the estimations.
All: please don't say testy things like "Did you actually read the article?" on HN.
This is one of those phrases that can always be deleted with instant improvement in comment quality. Check out how much more substantive and neutral this comment is without it.
Re-read what you've posted and, if you notice phrases that add nothing but testiness to your comment, edit them out. That's what I do.
