In 1967, graduate student Jocelyn Bell Burnell rechecked radio telescope recordings and noticed a bizarre, perfectly repeating pulse that returned every 1.3 seconds. Teammates initially brushed it off as “scruff,” but its consistency didn’t match anything known. The signal became the first evidence of neutron stars, unveiling pulsars and rewriting astronomy’s map of the sky.
NASA’s Perseverance rover has found a buried river delta beneath Mars, with sediment layers showing water flowed long enough to deposit material repeatedly. Instead of a planet briefly wet in isolated bursts, Mars likely cycled through multiple sustained wet periods. The result rewrites its ancient climate story and strengthens the hunt for past life.
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