Traveling to vietnam for They may have any inclination from ? to ?. Accordingly, they may journey around the Sun in a prograde counterclockwise or retrograde clockwise fashion. They are widely considered to originate in a nearly spherical region extending halfway to the nearest star, known as the Oort Cloud. These long-period comets, hailing from the deep and dark reaches of the solar system, far from the Sun’s light and warmth, have the potential to become notably bright as they approach the Sun, because they contain a high concentration of volatiles. They are visible for longer and at greater distances than short-period comets. Some are large, and a small percentage are giant size. With respect to their constitution, long-period comets also tend to be more fragile and susceptible to fragmentation. Traveling to vietnam 2016.