Caribbean waters have suffered the biggest loss of reefs last year. A one-two punch of bleaching from record hot water has been followed by disease, which killed ancient and delicate coral — scientists have ever witnessed in the Caribbean...

The Milky Way’s fastest pulsar has been observed. And to add to the amazing phenomenon of the space, it is now speeding out of the galaxy at more than 670 miles a second. The pulsar is propelled largely by a kick it received at its birth 2.5...