Andes glaciers, a vital source of fresh water for tens of millions of South Americans, are retreating at their fastest rates in more than 300 years, according to the most comprehensive review of Andes ice loss so far.
Two British girls, thought to be sisters, survived a shooting in the French Alps that killed four adults including those thought to be the children's parents. Police do not know the motive in the case.
A team of European astronomers say that about 40 percent of red dwarf stars - the most common type of star in the Milky Way - have at least one planet whose temperatures would allow liquid water on the surface.
The European Space Agency's Mars Express spacecraft detected sediments on Mars' northern plains that are reminiscent of an ocean floor, in a region that has also previously been identified as the site of ancient Martian shorelines, the researchers said.