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.
As much as I love to watch rockets launch, itâs quite a different experience to hear the countdown on the headset, see the altitude on the screen increase, and then a minute later feel the launch move through you. Itâs very emotional, and unbelievable when you realize the trajectory hits its target dead on.