Jessica Meir(@Astro_Jessica):Yesterday’s bone density scans. This DEXA (Dual-Energy X-ray Absorptiometry) machine uses low dose X-rays to measure bone density and body composition. Without the loading signal of gravity, our bones will leach calcium in space, which can lead to significant losses in bone density. This is why it is so important for us to exercise in space. Thanks to lots of weight lifting on the @Space_Station, the preliminary results show that the bone density in my spine actually increased in space!

Jessica Meir

@Astro_Jessica

NASA Astronaut. Scientist. Mother. Explorer. Nature lover. Back on Earth after another 7-month mission in space.

Joined June 2013

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Jessica Meir@Astro_Jessica

2026.10.21 14:48

Yesterday’s bone density scans. This DEXA (Dual-Energy X-ray Absorptiometry) machine uses low dose X-rays to measure bone density and body composition. Without the loading signal of gravity, our bones will leach calcium in space, which can lead to significant losses in bone density. This is why it is so important for us to exercise in space. Thanks to lots of weight lifting on the @Space_Station, the preliminary results show that the bone density in my spine actually increased in space!