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SpaceX hot fire tests its Starship vehicle three times in four hours
Enlarge / The Sun glints around the lower fin of Starship SN8 on Dec. 9, 2020. (credit: Trevor Mahlmann ) On Wednesday, in South Texas, SpaceX fired up its newest Starship prototype not once or twice. Rather, engineers and technicians fueled and test fired their SN9 prototype and its Raptor rocket engines three times in […]
The oldest hominin fossil ever found in the Levant
Enlarge (credit: Barash et al 2022) When the first members of our species ventured out of Africa, they walked into a world that earlier hominins, such as Homo erectus, had first explored a million years earlier. According to a recent study of a 1 . 5 million-year-old vertebra, those earlier hominins may have expanded beyond […]