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.
Thatâs what would be happening if the earth was flat. The fact that the sun rises and goes up to a zenith and then goes down into the horizon, shows that the earth is spherical in shape. You can travel a thousand miles around the earth and still see this exact same thing, because the earth is spherical in shape.