NASA has new evidence that the most likely places to find life beyond Earth are Jupiter's moon Europa or Saturn's moon Enceladus. In terms of potential habitability, Enceladus particularly has almost all of the key ingredients for life as we know it, researchers said.
In just the last week, the rookie commander-in-chief has presided over the use of some of the most powerful weaponry in the US arsenal, sending a signal that he is one President who relishes ordering the use of deadly force.
A US military strike with a weapon known as the "mother of all bombs" (MOAB) killed 36 IS militants and destroyed their base, the Afghan defence ministry says.
The Trump administration plans to sell fighter planes to Nigeria despite concerns over rights abuses and a botched air strike that killed scores of civilians in January, US media say.
The Trump administration warned that it’s ready to take further military action if the regime of Bashar al-Assad wages another chemical attack, even as this week’s missile strike ratcheted up tensions with Russia.
An explosive device has been made safe in a flat in St Petersburg by Russian police, three days after a suspected bomber on the city's metro killed 13 people.