LONDON—The Swedish armed forces are in the midst of a major operation in the waters of the Stockholm archipelago after “credible sightings” of a possible submarine. The naval operation, which began on Oct. 18, comes after what officials describe as “several credible sightings” of an object at three different locations in the region. Senior officers said the Swedish navy was “seeking to confirm foreign submarine operations.”
The comet Siding Spring 2013 whizzed past Mars on Oct. 19, leaving the constellation of scientific spacecraft orbiting the planet undamaged and beginning to transmit the scientific take from their unprecedented close encounter with an Oort Cloud object.
