1Two surprising facts first
Gravity is still there — and "heavy" means something pushes back
You only need two ideas. Watch each one:
Gravity doesn't stop in space
Earth's pull reaches way up. Where the space station flies, gravity is still almost as strong as on the ground — about 9 out of every 10 pulls you feel right now.
"Heavy" is the floor pushing you
You feel your weight because the floor shoves back up on you. Take that push away — if you and the floor fall together — and you feel nothing at all.
2Two ways to be up high
The bolted tower vs the falling ship
Picture two stations at the exact same height, in the exact same strong gravity. They behave in opposite ways:
Bolted to a giant tower
The tower holds it up, so it never falls. The astronaut stands on the floor with normal weight.
Let go into orbit
Nothing holds it. The whole ship falls — but races sideways so fast it keeps missing the ground.
3Your turn — be the rocket
How fast sideways do you need to go to keep missing Earth?
Gravity always curves the ship's path down toward Earth. Slide the sideways speed and watch where the ship goes. Too slow and it crashes. Fast enough and it circles forever — that's an orbit.
4Now run the real test
Same height, same gravity — so why does only one float? 🛰️
Two stations sit at the same height in the same strong gravity. One is bolted to a tower (held still). One is let go into orbit (falling). Predict first — then let the astronaut go and watch.
Guess before you let them go
Up in space gravity is still strong. So why do astronauts float?