July 24, 2022

Virtually all the contiguous United States experienced above normal temperatures in the past week, with more dangerously hot weather forecast. The U.S. heat wave followed record heat that killed hundreds if not thousands of people and sparked wildfires in Europe. Following is an explanation of what is causing the heat waves, according to scientists. What is a heat wave? A heat wave has no single scientific definition. Depending on the climate of a region, it can be determined by a certain number of days above a specific temperature or percentile of the norm. Arctic warming and jet stream migration The

China on Sunday launched the second of three modules to its permanent space station, in one of the final missions needed to complete the orbiting outpost by year’s end. A live feed on state broadcaster CCTV showed the 23-ton Wentian (“Quest for the Heavens”) laboratory module launching on the back of China’s most powerful rocket, the Long March 5B, at 2:22 p.m. (0622 GMT) from the Wenchang Space Launch Center on the southern island of Hainan. Space agency staff, seen on the live feed observing the progress of the launch from a control room, cheered and applauded when the Wentian