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.
You can see stars with your unaided eyes during a total eclipse when the sun is not contributing as much light to the sky. With a telescope it is possible to see stars in the sky during the daytime. See the link for the procedures to follow.