Actually, radio waves do go out into space. However, depending on frequency, they do tend to bounce off of the ionosphere, which is why lower frequency waves such as AM and longwave have greater (on Earth) range than higher frequency waves, such as FM or microwave.
Gravity keeps stuff on Earth!
radio waves
radio waves
On Earth, the gravity of planet Earth keeps us on the floor.
The same thing that keeps you from floating out into space. Gravity.
gravity
Gravitational pull from the sun
Earth's gravitational pull
it doesn't the earth spins around the sun. the sun's gravity keeps us from flying aimlessly through space. and the spinning of the earth around the sun keeps us from being drawn into the sun.
Earth has been broadcasting radio signals into outer space since the late 1800's.
The gravitational attraction of the Earth keeps the atmosphere from floating off into space
The space station is orbiting the earth. That means it is constantly falling, but falling AROUND the Earth. Satellites do the same thing.