Esophageal cancer describes the disease where cells that line the esophagus change or mutate and become malignant. These cells grow out of control and form a mass or tumor. There are two main types of esophageal cancer:
Trajectory. A trajectory is the path that a moving object follows through space as a function of time. The object might be a projectile or a satellite, for example. It thus includes the meaning of orbitâthe path of a planet, an asteroid or a comet as it travels around a central mass.
A trajectory is nothing more than the path an object follows as it moves through space. For this lesson, we are going to concentrate on a ballistic trajectory, which is the path an object follows through space after it is initially launched, with its path dictated only by the laws of motion, gravity and possibly air resistance.