Why is there a paywall article on the front of Hacker News?

NG forces people to enter email address without a close button.

> Not only did the photographers capture a significant number of red sprites, the Himalayan storm also featured even rarer TLEs called jets and ghosts. The team found 16 secondary jets, powerful columns of often blue or purple light darting upwards into the sky, and at least four ghosts, green hazy glows that can sometimes hover above red sprites.

Oddly we will just have to take the author’s word for it, because no photographs depicting those rarer TLEs appear in this article.