"Archaeologists did not expect to find such well-preserved structures in such a harsh setting," geologist Yves Fouquet said.

A German social media ban for children will face legal hurdles, mainly from European law, according to a report by parliament's scientific service seen by dpa on Sunday. Parents' rights on how they bring up their children, which are constitutionally guaranteed in Germany, could also present an obstacle to a ban on social media platforms, says the report, which was commissioned by the far left Die Linke opposition party.

The Hubble Telescope appears as a tiny silhouette during a perfectly timed solar transit captured from Puerto Rico.