Question

Why the Astronauts bones are weak after returned to earth!​

Answer 1

Astronauts regain most of their bone mass in the months following their return from space, but not all of it. The exact mechanism that causes the loss of calcium in microgravity is unknown. Many scientists believe that microgravity somehow causes bone to break down at a much faster rate than it is built up

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Answer 2

Answer:

I think because of gravity

Explanation:

When anyone go to outer space his visiting planet has very low gravity than earth .