Understanding the Effects of Space Travel on Astronauts

Why do astronauts find it difficult to walk on Earth after returning from space?

• They are too tired from the journey.

• They are not used to Earth's weather.

• Their sense of orientation is affected by zero gravity.

• They forget how to walk.

How does zero gravity affect astronauts' vestibular system?

• It has no effect.

• It enhances their balance.

• It improves their hearing.

• It causes dizziness and disorientation.

What are some of the physical effects of long-term space travel on astronauts?

• Enhanced vision

• Increased bone density

• Improved muscle strength

• Muscle atrophy and skeletal deterioration

What changes were reported in astronauts' brain structures after space travel?

• No changes were observed.

• Their brains became smaller.

• Their brains became larger.

• Significant changes were reported.

Why do astronauts exercise for at least two hours a day in space?

• To pass the time

• To maintain muscle mass and bone density

• To improve their mood

• To prepare for spacewalks