The age old question of how we came to be as humans on this planet is probably one of the most common questions ever asked. One of the answers to that question comes now from Harvard University’s theoretical physicist Lisa Randall and it brings up the point that dark matter might be the cause of our existence.
Ever since we started to evolve as a civilization, we always wondered how we got here, be it by the grace of supernatural entities such as gods and deities or by the process of natural evolution. The theory which Lisa Randall made is one that is connected to the evolution theory and it explains why the dinosaurs were wiped out, making mammals, and eventually us humans, take their place in the grand scheme of things.
This theory suggests that the meteor which crashed 66 million years ago in the Yucatan desert in Mexico and wiped out the dinosaurs was thrown there by a dark matter disc which comes near our solar system every 25-35 million years during our journey around the galaxy core, journey called a galactic year (roughly 225 million terrestrial years).
Dark matter comprises more than 75% of our universe and it lives in our studies just in theory, because we cannot observe it exactly, we can only see the effects that its gravity has. This gravity possessed by dark matter is what flung the asteroid towards us 66 million years ago, mostly by accident. The dark matter disc theory describes that a disc floats around the galaxy and influences our solar sistem once every 30 million years when we approach it during our journey.
One of the reasons this theory makes sense is that Earth goes through an asteroid collision every 25 to 30 million years, even though the impact differs due to the size and shape of said asteroid. The one that presumably wiped out the dinosaurs was about 9 miles long and it affected 75% of the inhabitants of our planet.
One interesting theory that physicist Lisa Randall proposes is that dark matter has different versions of itself, similar to normal visible matter. One such version could be similar to regular photon, emanating energy, thus creating a disc around the Milky Way core, though 100 times thinner and with a density around 20 times larger than a disc formed by regular protons.
This dark matter disc would have pulled an asteroid from the Oort cloud (an assembly of various comets and asteroids that travels through our Milky Way) and flung it towards our planet, thus creating the theory that dark matter might be the cause of our existence by eliminating the dinosaurs, giving us room to evolve and grow.