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.
When astronomers use words like âplanetary alignmentâ, they donât mean a literal lining up. They just mean that some of the planets are in the same general region of the sky. And this type of âalignmentâ almost never happens to all the planets, but instead happens to two or three planets at one time.n reality, the planets do not all orbit perfectly in the same plane. Instead, they swing about on different orbits in three dimensional space. For this reason, they will never be perfectly aligned. Itâs like waiting for a swarm of flies circling your head to all line up.