At large distances from the Sun, any comet looks like a hazy speck, that is, it has no tail. When approaching the Sun, the comet nucleus heats up and gas and dust are released from it, which, under the influence of the pressure of solar radiation and solar wind, form a tail. In addition, at large distances from the Sun, the phase angle of the comet is very small and the comet is observed from the Earth, as it were, in full face.
Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.