Credit : From NASA
From modern photographs, one can easily get acquainted with the variety of forms of comets and trace the changes in these forms, which makes it possible to call comets celestial chameleons because they are changeable.
Large and bright comets observed with the naked eye, as a rule, all had tails. Comets are small and dim, often have barely visible short tails, visible only in photographs, and sometimes they don’t even have tails at all. Many comets are visible only through a telescope, like faint specks of mist, fuzzy at the edges; they are called telescopic. But any bright comet is telescopic, small and weak when it is far from the Sun. Her tail appears and grows as she approaches the Sun, and with distance from it again decreases and disappears. Comets, like lizards, are able to lose their tails and regenerate them