Archive · 21 Jan 2026
Space Travel Alters Astronauts' Brain Position
Scientists found that astronauts' brains shift upward and backward inside their skulls when they go to space.
This happens because of the lack of gravity.
The changes can make astronauts feel dizzy and unbalanced.
Most of the changes go back to normal after about six months on Earth, but some changes last longer.
The study also found that the longer astronauts stay in space, the more their brains shift.
Scientists think this is important for future space missions to the Moon and Mars.
They need to understand these changes to keep astronauts safe and healthy.
The study used brain scans from astronauts and people who stayed in bed for a long time to simulate space conditions.
The researchers say more studies are needed to fully understand how space affects our brains.
Astronauts' brains shift upward and backward in microgravity, affecting sensory and motor regions.
Brain changes can cause disorientation and loss of balance, persisting for up to six months post-flight.
Longer space missions result in more significant brain shifts, with some changes lasting longer.
The study compared MRI scans of 26 astronauts to 24 Earth-bound volunteers on bed rest.
Further research is needed to understand the long-term effects of space travel on human brains.
- Who
- Astronauts and Earth-bound volunteers
- What
- Brain position and shape changes due to space travel
- When
- Study published in PNAS this month
- Where
- Research conducted by US scientists
- Why
- To understand the effects of microgravity on human brains
- Study Source
- PNAS (Proceedings of the National Academy of Sciences)
- Participants
- 26 astronauts and 24 Earth-bound volunteers
- Brain Shift
- Upward and backward within the skull
- Duration of Effects
- Up to six months post-flight
- Key Findings
- Sensory and motor regions show largest shifts
- Long-Term Implications
- Potential complications for long-duration space missions
- Research Limitations
- Small sample size of long-duration spaceflights