Paris, France's capital, displays why it is known as the "City of Lights" in this photo taken from on board the International ...

Aurora chasers are on high alert for geomagnetic storm conditions overnight with northern lights possible at mid-latitudes.

"The aurora does not need to be directly overhead but can be observed from as much as a 1,000 km [621 miles] away when the aurora is bright and if conditions are right," the agency explains on its ...