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Scott Kelly

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Earthbound after a year in space: Scott Kelly finds return to normal life oddly unfamiliar
science1 month ago

Earthbound after a year in space: Scott Kelly finds return to normal life oddly unfamiliar

Scott Kelly’s 340 days aboard the ISS yielded not only physical effects like fluid shifts and balance issues but also a lasting psychological readjustment: weeks of detachment and a sense of watching one’s life from behind the eyes, a “reverse overview effect” that underscores the need to plan postflight transition as longer missions loom, with Artemis II and mars-bound crews likely facing similar challenges.

Five-Millisecond Time Gap: Relativity in Real Life on the ISS
space3 months ago

Five-Millisecond Time Gap: Relativity in Real Life on the ISS

The ISS travels at about 17,500 mph, causing time to pass slightly slower up there; after 340 days in orbit, Scott Kelly was about 5 milliseconds younger than his Earthbound twin Mark. The effect is real and purely relativistic, with gravity counteracting some aging, but the velocity effect dominates on the station. NASA studied the twin pair to track biological changes—telomeres lengthened, some gene expression stayed altered months after return, and various physiological shifts occurred—illustrating how long-duration spaceflight acts as a tiny, measurable form of time travel for humans.