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.
Earth view from Apollo 11. Have you ever why the Earth is tilted instead of just perpendicular with its plane of orbit. Scientists have taken a crack at answering that question. The main consensus is that it has to do with Earthâs formation along with the rest of the planets in the Solar system.