In a recently published study, retired astrophysicist Daniel Whitmire argues that the mass extinctions on Earth can be attributed to comets and debris being propelled into the inner solar system every 27 million years due to Planet X’s orbit.

Earth is believed to have undergone five mass extinctions thus far, and one retired astrophysics professor thinks he knows what could have caused them. 
In a recently published study, Daniel Whitmire argues that presently undiscovered Planet X is responsible for an onslaught of comets colliding into Earth every 27 million years or so and destroying life including the dinosaurs. 
In 1985, W