Zero Gravity

In orbit, objects and astronauts seem to float because they are constantly falling around Earth. This is often called zero gravity, although gravity is still present.

Long stays in orbit can weaken bones and muscles.

The spacecraft and everyone inside it fall at the same rate, so they feel weightless.

Floating can make everyday tasks tricky. Astronauts must strap things down, eat carefully and move with control. Zero gravity affects the body too, which is why astronauts exercise every day to protect their muscles and bones.