For thousands of years, we humans had been wondering many things regarding our physical existence. How did life emerge on Earth? Why does the Sun shine? What or who put it in its place? How was our planet born? Why do we exist in the first place? While science has been given some answers to these questions, they cannot be considered irrefutable. And yet even new studies are coming to show us that humanity still has a lot more to learn.
While a lot of people are claiming the need for an omnipotent being to create the Solar System, others are saying that the system’s existence could actually have been just a cosmic accident.
A collision of galaxies is the answer
A new wild theory says that a collision between our own Milky Way galaxy and another one called Sagittarius led to the formation of our Solar System that occurred 4.7 billion years ago. This claim emerged after a new study was made based on data gathered by ESA’s galaxy mapping powerhouse Gaia. The scientists claim that the ripples caused by the collision could trigger major star formation episodes, and one of them seemed to have occurred during the time of the formation of our Sun about 4.7 billion years ago.
Tomás Ruiz-Lara, who is leader of the new study and an Astrophysicist at the Instituto de Astrofísica de Canarias (IAC) in Tenerife, Spain, declared:
It is known from existing models that Sagittarius fell into the Milky Way three times—first about five or six billion years ago, then about two billion years ago, and finally one billion year ago,
When we looked into the Gaia data about the Milky Way, we found three periods of increased star formation that peaked 5.7 billion years ago, 1.9 billion years ago and 1 billion years ago, corresponding with the time when Sagittarius is believed to have passed through the disc of the Milky Way.
The new study was published in Nature Astronomy.