Followers and readers of Zecharia Sitchin will know that the information about Nibiru comes from the Sumerians and the writing and artifacts they, and other ancient people, left behind. The core premise he has made in his writings is that there is a 10th Planet (again, including Pluto) in our solar system with an elliptical orbit of about 3600 of our years. People from Nibiru came to Earth and discovered the gold they needed to help repair their atmosphere and they began mining it.
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Zecharia believed that the Biblical Deluge was caused by the gravitational pull of Nibiru causing the Antarctic ice cap to slip into the ocean and create a world-wide tsunami that inundated the Earth. In pre-history, Nibiru, or its moons, may have collided with Earth, exchanging genetic material that allowed life on both planets to evolve with compatible DNA. Most of the time, when Nibiru came into the vicinity of the solar system near the sun and the other known planets, there were no incidents of concern.
Readers of Zecharia Sitchin's work will be inclined to believe there is a Nibiru and that the ancient Sumerians were writing from the knowledge of the Anunnaki about the planet, its orbit, its inhabitants, especially those who came to Earth, and of the origins of life on our planet Earth. They will say, as Zecharia did, that there is no doubt that there is a Nibiru. While we agree that there is no need for panic, we otherwise respectfully disagree with Morrison on this subject.