Final answer:
Satellites moving at a high speed stay in orbit because their high speed allows them to maintain a balance between gravity's pull and their forward motion.
Step-by-step explanation:
Satellites moving at a high speed stay in orbit because their high speed allows them to maintain a balance between gravity's pull and their forward motion. This is known as the centripetal force.
Once an artificial satellite is in orbit, it behaves just like a natural satellite, such as the Moon. As long as the satellite is high enough to be free of atmospheric friction, it will remain in orbit forever, without the need for any anti-gravity technology, invisible tethers, or rocket engines to stay in orbit.
However, it's important to note that a great deal of energy is required to lift the spacecraft off Earth and accelerate it to orbital speed. Once it achieves the necessary speed, it can maintain a stable orbit.