Interstellar visitor may have altered planetary orbits in Solar System, say scientists
A group of scientists has proposed that a massive interstellar object, potentially eight times the size of Jupiter, might have dramatically influenced the orbits of planets in our solar system. The study, currently published on the arXiv preprint database but not yet peer-reviewed, suggests that this celestial intruder passed close to where Mars orbits today, reshaping the paths of Jupiter, Saturn, Uranus, and Neptune.
For years, researchers have noted a discrepancy between the ideal concentric, planar arrangement of planetary orbits and their current three-dimensional orientations. To investigate, the team hypothesized that approximately four billion years ago, a star-sized object entered our solar system. They conducted 50,000 simulations over 20 million years, varying the visitor's mass, velocity, and proximity to the Sun.
Their findings indicate that in about 1% of scenarios, the object's gravitational influence could explain the current orbital patterns of the planets. According to the simulations, the interstellar visitor may have approached within 1.69 astronomical units (AU) of the Sun—just beyond Mars' present orbit. Such proximity would have allowed its gravity to nudge the planets into new trajectories.
While previous theories attributed these irregularities to interactions among the planets themselves, this study posits that a one-time interstellar event may provide a more plausible explanation. The researchers also called for further investigation into the potential effects of such an encounter on minor planets in the asteroid belt and the trans-Neptunian region.
"We estimate that there is about a 1-in-100 chance that such a flyby produces a dynamical architecture similar to that of the solar system," the researchers stated, adding that this encounter could account for the moderate eccentricities and inclinations observed in planetary orbits.
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TMC leader killed in Bengal's Birbhum
Kolkata (PTI): A local Trinamool Congress (TMC) leader was murdered by unidentified assailants in West Bengal's Birbhum district, police said on Saturday.
Rajbehari Sardar (65), TMC's booth chief in Patisara gram panchayat, was stabbed and severely beaten up by around five-six people at a function in Nanoor area around 10 pm on Friday, a police officer said.
Sardar was taken to Mangalkot Hospital in neighbouring Purba Bardhaman district where he was declared dead by doctors, he said.
The deceased's son alleged that Sardar was killed by members of a rival faction of the party.
The local TMC leadership said Sardar was a committed party worker and was popular in the area, but claimed that there was no report of the involvement of anyone from the party in the murder.
"We demand a thorough and prompt investigation into the incident," a local TMC leader said.
