The Earth's infrequent but predictable path around and through our Galaxy's disc may have a direct and significant effect on geological and biological phenomena occurring on Earth, new research has found.
The researchers found that the movement through dark matter may perturb the orbits of comets and lead to additional heating in the Earth's core, both of which could be connected with mass extinction events.
The Galactic disc is the region of the Milky Way Galaxy where our solar system resides.
"We are fortunate enough to live on a planet that is ideal for the development of complex life," said Michael Rampino, professor of biology from New York University.
The history of the Earth is punctuated by large scale extinction events some of which scientists struggle to explain.
"It may be that dark matter - the nature of which is still unclear but which makes up around a quarter of the universe - holds the answer. As well as being important on the largest scales, dark matter may have a direct influence on life on Earth," he explained.
Analysing the pattern of the Earth's passes through the Galactic disc, Rampino said that these disc passages seem to correlate with times of comet impacts and mass extinctions of life.
The famous comet strike 66 million ago that led to the extinction of the dinosaurs is just one example.
What causes this correlation between Earth's passes through the Galactic disc, and the impacts and extinctions that seem to follow?
"While travelling through the disc, the dark matter concentrated there disturbs the pathways of comets typically orbiting far from the Earth in the outer Solar System," Rampino said.
This means that comets that would normally travel at great distances from the Earth instead take unusual paths, causing some of them to collide with the planet.
But even more remarkably, with each dip through the disc, the dark matter can apparently accumulate within the Earth's core.
Eventually, the dark matter particles annihilate each other, producing considerable heat.
The heat created by the annihilation of dark matter in Earth's core could trigger events such as volcanic eruptions, mountain building, magnetic field reversals, and changes in sea level, which also show peaks every 30 million years.
According to Rampino, astrophysical phenomena derived from the Earth's winding path through the Galactic disc, and the consequent accumulation of dark matter in the planet's interior, can result in dramatic changes in Earth's geological and biological activity.
In the future, he suggests, geologists might incorporate these findings in order to better understand events that are now thought to result purely from causes inherent to the Earth.
The paper was published in the journal Monthly Notices of the Royal Astronomical Society.
