http://ycombinator.com/newsguidelines.html 'Please submit the original source. If a blog post reports on something they found on another site, submit the latter.'

Also, there is nothing 'secret' about these - they appear to be an entirely natural phenomenon.

Ah, the warmth of hn. Submit multiple articles. Get some upvotes but no comments. Then get the only reply you will get for the day advising you that you are a fuckup.

I believe the original is linked in my comment below. I did not post it as the headline because of the paywall and because I liked the illustration with the Eiffel Tower giving some idea of scale, which the original appears to lack.

But, hey, have an upvote for bothering to comment.

More scientific but there is a paywall: http://www.nature.com/ngeo/journal/vaop/ncurrent/full/ngeo19...