Earphone definition, a sound receiver that fits in or over the ear, as of a radio or telephone. See more.
Answer Wiki. If a rocket went straight up, it would either continue in that direction and leave Earth, or it would fall back down, depending on its velocity. Most rockets intend to enter orbit, which is an elliptical trajectory, and it's much more efficient to arc into this trajectory than to go straight up and then accelerate laterally.
Best Answer: The same way all other moons and satellites stay in orbit-thanks to the balance between gravity and the moon's own inertia. Gravity tries to pull the moons to the planet, but their inertia tries to keep them going in a straight line. The result is that the moons neither fall to the planet, nor fly off.