A Reddit user recently posted a video showing an unusual streak in the sky, sparking a wave of speculation online. The video, shared in the r/weather subreddit, shows what appears to be a thick, ...

Contrail shadow way above you ... Newsweek has contacted the original poster for comment via TikTok. This video has not been independently verified. A stock image of a view over clouds seen ...

Contrails are an instant visual reminder of air travel, and a source of much controversy in recent decades. Put aside the overblown conspiracies, though, and there are some genuine scientific ...