NEW YORK: When we go through the history of the Earth, we come to know that more than 99 % of living creatures of different species that ever walked on the surface of the Earth have wiped out. Ecological reasons and tragic calamities hitting the Earth, for instance in the form of comets, are said to have led to the mass extinction of those species. A recent study has suggested a new possibility involving dark matter, the mysterious invisible subatomic particles that might account for much of our universe make-up.
The large-scale disappearances of species of the Earth seem to have happened in cycles of around 26 to 30 million years – or so indicate the fossil records. This time lapse fits with the amount of time that our planet takes to pass through the galactic disk of the Milky Way. This region of the Milky Way consists of clouds of dust and gas, and perhaps high levels of dark matter.
Dark matter has not been witnessed by humans. But, scientists purport it indeed exists. They argue that it causes gravitational effects on other heavenly bodies. The scientists have suggested that each square light-year of the region constituted by the galactic plane has about one solar mass of dark matter.
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