Ukrainian President Volodymyr Zelenskyy replaced his top army general on Thursday in what amounts to a major shake-up of the country’s war strategy as the war with Russia grinds into its third year and Ukraine grapples with shortages of ammunition and personnel. In a social media post, Zelenskyy said he thanked Gen. Valerii Zaluzhnyi – a military leader popular with …

SpaceX launched an environmental research satellite for NASA early Thursday, a nearly $1 billion spacecraft that survived multiple cancellation threats and is now poised to shed new light on climate change and the complex interplay of heat-trapping carbon, aerosols and sea life on global scales. The Plankton, Aerosol, Cloud, ocean Ecosystem mission — PACE — “will dramatically advance our understanding …

Grindavik, Iceland— A volcano in southwest Iceland erupted for the third time since December on Thursday, sending jets of lava into the sky and triggering the evacuation of the Blue Lagoon spa, one of the island nation’s biggest tourist attractions. The eruption began at about 1 a.m. Eastern time along a nearly two-mile fissure northeast of Mount Sundhnukur, the Icelandic …