Why do astronauts float if there's still gravity up there?
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After you watchWhy do astronauts float if there's still gravity up there?
The short answer
Astronauts in orbit and their spacecraft are in free fall together. Gravity remains strong, but there is little support force pressing them against the floor.
Try this next
- What changes when the cabin is held up? Run the orbit and tower cases. Compare floor contact while the downward gravity stays the same.
- Can a ship fall without hitting Earth? Try different sideways speeds in the path model. Describe which path keeps missing the ground.
Now you — bend it
- What if What if you replay exactly the same starting conditions?Run both station modes and compare the floor contact. Replay either mode from its starting state.
Can you prove it?A matched comparison can test your prediction. — Run both station modes and compare the floor contact. Replay either mode from its starting state.
Design your own test:Choose a supported setting and predict its result before running it.
Explain it to a 6-year-old: Astronauts in orbit and their spacecraft are in free fall together. Gravity remains strong, but there is little support force pressing them against the floor.
The whole story
How it works
The ingredients show gravity and a contacting floor’s upward force separately. Practice varies a ship’s sideways speed and displays its path, without previewing the astronaut’s cabin response. The hidden test compares the tower-supported floor with a freely orbiting cabin.
What people get wrong
The giant tower is a thought experiment. The orbit model omits atmospheric drag; real low-orbit spacecraft need occasional boosts. Microgravity does not mean that Earth’s gravity has vanished.
The catch
The giant tower is a thought experiment. The orbit model omits atmospheric drag; real low-orbit spacecraft need occasional boosts. Microgravity does not mean that Earth’s gravity has vanished.
Questions kids ask
Why do astronauts float if there's still gravity up there?
Astronauts in orbit and their spacecraft are in free fall together. Gravity remains strong, but there is little support force pressing them against the floor.
What can I change in this experiment?
Sideways path speed in practice; tower versus orbit after prediction.
Does this model describe every real case?
The giant tower is a thought experiment. The orbit model omits atmospheric drag; real low-orbit spacecraft need occasional boosts. Microgravity does not mean that Earth’s gravity has vanished.
Talk about it
- Which astronaut keeps feeling a floor push: both, or only the one in the tower-held cabin?
- Which observation supports your explanation?
- What does this model leave out?
For grown-ups
The ingredients show gravity and a contacting floor’s upward force separately. Practice varies a ship’s sideways speed and displays its path, without previewing the astronaut’s cabin response. The hidden test compares the tower-supported floor with a freely orbiting cabin. The giant tower is a thought experiment. The orbit model omits atmospheric drag; real low-orbit spacecraft need occasional boosts. Microgravity does not mean that Earth’s gravity has vanished.
Keep going
What else makes you wonder?
- What would you change for a new test?
- Which two things must stay the same for a fair comparison?