This week’s science news was largely dominated by the return of two NASA astronauts from the International Space Station, whose planned eight-day mission ended up lasting 286 days.
Astronauts Butch Wilmore and Suni Williams lifted off from Florida’s Cape Canaveral Space Force Station on June 5, 2024, but not long into the mission helium leaks, along with a number of other issues, were discovered on their Boeing Starliner spacecraft.
Starliner had already suffered years of delays, and although it was later suggested the pair would have been fine to return home on the suspect vessel, the risk to their safety was considered too great. As such, it wasn’t until 5:57 p.m. ET on Tuesday (March 18) that the astronauts finally splashed down near the coast of Florida, after hitching a lift aboard a SpaceX Dragon capsule.
While much of the attention on them focused on the duo being “stranded” in space, it’s not a sentiment the pair shared. In a conversation with CNN’s Anderson Cooper, they explained how mission extensions are sometimes just part of the job.
“We come prepared, we come committed. That is what your human spaceflight program is: It prepares for any and all contingencies that we can conceive of, and we prepare for those,” Wilmore told Cooper. “We don’t feel abandoned. We don’t feel stuck. We don’t feel stranded.”
Mystery ancestors
In a study published Tuesday, researchers presented a new method of modeling genomic data, called “cobraa,” that has enabled them to trace the evolution of modern humans (Homo sapiens).
They found that the ancestors of all modern humans split off from a mystery population 1.5 million years ago and then reconnected with them 300,000 years ago. This unknown population contributed 20% of our DNA and may have boosted humans’ brain function.
“The fact that we can reconstruct events from hundreds of thousands or millions of years ago just by looking at DNA today is astonishing, and it tells us that our history is far richer and more complex than we imagined,” study co-author Aylwyn Scally, a geneticist at the University of Cambridge, said in a statement.
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