IS PLANET EARTH A COSMIC ZOO FOR EXTRATERRESTRIALS

Scientists and astronomers are beginning to ask questions as to why we have not made contact with extraterrestrials from outer space. They hypothesize that life is probably abundant in the universe, yet we are met with silence. Is this because the extraterrestrials know that we are not ready to become part of the cosmic neighborhood. Or are we just a cosmic Zoo for some higher life-form?