SOLAR SYSTEM

Detailed explanation-1: -Plasma tails follow the path of the solar wind (which travels radially away from the sun). Thus, plasma tails form straight lines behind the comet head following the direction of the solar wind. They eventually cease to receive enough light to be seen and dissipate after leaving the inner solar system.

Detailed explanation-2: -As can be seen from the diagram, the tail of the comet always point away from the Sun, so after a comet has passed the Sun it actually travels tail first.