This new gravitational wave detection provides insight into how black holes spin. As two black holes orbit one another, they are also turning on their individual axes.

Disney CEO, Robert Iger also announced he was leaving the president's council over the Paris Agreement, while Apple CEO Tim Cook expressed disappointment.

The violence unfolded as government forces were engaged in a second week of fighting against Islamic State group-aligned militants in the southern city of Marawi.

The abdication issue has highlighted concerns over a potential succession crisis in one of the world's oldest monarchies.

The Mosul offensive, now in its eighth month, has taken much longer than expected, with Iraqi government advances slowed by the need to avoid civilian casualties.

Trump said the Paris accord would undermine the U.S. economy and put the country at a permanent disadvantage to the other countries of the world.