UV Radiation Contributed to Earth’s Biggest Mass Extinction

New models shed light on life's origin

Readers ask about sea level rise, the universe’s first stars and more

SpaceX on Twitter: Super Heavy Booster 7 completed a full duration static fire test of 31 Raptor engines, producing 7.9 million lbf of thrust (~3,600 metric tons) – less than half of the booster’s capability