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.
Therefore, it seems that the visual of a rocket launching vertically from the launch pad, leaving a humongous cloud of gas and smoke, is here to stay. 1  Wikipedia. 2  NASA Space Place. 3  Spacecraft Into Orbit â Qualitative Reasoning Group Northwestern University. 4  Stack Exchange.