Impact of Space Travel on Astronaut Health

Sub : Sci

Sec : Space sector

Why in News

Space agencies worldwide, including NASA and ISRO, are preparing for long-duration space missions, such as Mars exploration and extended lunar stays. Understanding the physiological and psychological impacts of space travel on astronauts is crucial for mission success and long-term human space habitation.

Effects of Space Travel on Astronaut Health:

Exposure to High-Energy Radiation: This radiation can cause DNA damage, increased cancer risk, neurodegenerative effects, and immune system dysregulation.
Impact of Microgravity: The absence of gravity reduces mechanical stress on bones and muscles, leading to bone density loss and muscle atrophy.
Cardiovascular Changes: Gravity is essential for regulating blood circulation. In microgravity, astronauts experience fluid shifts that cause swelling in the upper body.
Vision and Neurological Issues: Microgravity-induced fluid shifts increase intracranial pressure, affecting vision. This condition, known as Spaceflight-Associated Neuro-Ocular Syndrome (SANS), leads to visual impairments.
Psychological and Behavioural Challenges: Isolation and confinement in space can lead to sleep disturbances, mood disorders, and psychological stress.
Haemolytic anaemia: Extended exposure can lead to haemoglobin degradation, resulting in haemolytic anaemia.
Medication Stability: Medications stored in space may degrade faster due to radiation and microgravity, potentially becoming ineffective or harmful, which poses a significant risk for long-term missions.

Post-Mission Recovery: The recovery process depends on the duration of the mission.

Short-term missions (a few days in low-earth orbit): About 95% of biological damage is reversed.
Long-term missions (months aboard the ISS): Recovery takes longer, with some effects persisting post-return.