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.
The centripetal force that keeps the International Space Station in orbit around the Earth is due to the gravitational pull between the Earth and the space station. This gravitational force causes the space station to constantly fall towards Earth, but its tangential velocity keeps it moving sideways, resulting in a stable orbit.
Earth has been broadcasting radio signals into outer space since the late 1800's.
The space station is orbiting the earth. That means it is constantly falling, but falling AROUND the Earth. Satellites do the same thing.
by radio
radio
Radio waves travel with the highest speed in vacuum, and slightly slower in air. So they move slightly faster in space than on earth.
The force of gravity between an object and Earth keeps objects from floating into space. Gravity acts as a force of attraction that pulls objects towards Earth's center, preventing them from drifting off into space.