What is aquarius disappears and comes back?

There is no such phenomenon as Aquarius disappearing and coming back. Aquarius is a zodiac sign and it does not have any physical form or ability to disappear and reappear. However, some people who are born under the Aquarius sign may exhibit certain personality traits that may make them seem aloof or detached at times. They may withdraw into themselves and seem to disappear from social settings, but this is just a natural aspect of their personality and not a literal disappearance. They may later re-emerge and become sociable again, but again, this is not a sudden reappearance, but maybe a change in mood or mindset.