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.
Rockets in Ancient Times (100 B.C. to 17th Century) Ever since humans first saw birds soar through the sky, they have wanted to fly. The ancient Greeks and Romans pictured many of their gods with winged feet, and imagined mythological winged animals.