Astronomer Mike Brown notes that if this object's orbit were as described, it would only have remained in the Solar System for about a million years before Jupiter expelled it, and, even if such a planet existed, its magnetic field would have no effect on Earth's. Lieder's assertions that the approach of Nibiru would cause the Earth's rotation to stop or its axis to shift violate the laws of physics. In his rebuttal of Immanuel Velikovsky's "Worlds in Collision", which made the same claim that the Earth's rotation could be stopped and then restarted, Carl Sagan noted that, "the energy required to brake the Earth is not enough to melt it, although it would result in a noticeable increase in temperature: The oceans would raised to the boiling point of water ... [Also, how does the Earth get started up again, rotating at approximately the same rate of spin? The Earth cannot do it by itself, because of the law of the conservation of angular momentum."