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Now astronomers have identified a more permanent external presence in our solar system. It is a group of interstellar asteroids that were verified long ago and never left. They’ve been hidden from view for billions of years, according to a new study published this week in the Royal Astronomical Society’s monthly notices.
These asteroids existed when our solar system was forming 4.5 billion years ago. They originated from a different star system. And while our solar system was forming, it was probably close to other infant star systems.
“The proximity of the stars meant they felt the gravity of each other in the present,” the researcher and author of the Cote d’Azur Observatoire study said in a statement. . “It allowed asteroids to be dragged from one star system to another.”
Namoni and her fellow researcher Maria Helena Moreira Morais from the Universidade Estadista Paulista in Brazil used numerical models to simulate the infancy of our solar system and determine the location of asteroids billions of years ago.
The simulation placed the asteroids in a plane to move in a vertical orbit, where planets and asteroids in the solar system orbit around the Sun. The asteroids were also far from the original disk, where planets formed around the Sun.
This demonstrated that asteroids were captured from another star system as planets formed in our solar system.
Since then, the 19 asteroids have been hidden from the naked eye, orbiting the Sun, as well as an asteroid called Centaurs that can be found between Jupiter and Neptune.
Centaurs are unusual in that they look and act like asteroids and comets. It is twofold that Centaurs have been named after mythology, half horses, half human creatures. According to NASA estimates, two-thirds of the centaurs came from outside the solar system.
Centaurs are also locked in circles that are difficult to understand or predict.
“Discovering the entire population of asteroids of interstellar origin is an important step in understanding the physical and chemical similarities and differences between interstellar and sun-born asteroids,” Morris said in a statement. The group of early sun births, how the capture of interstellar asteroids took place and the role of interstellar matter in the chemical enrichment of the solar system and in the configuration of its evolution. “
Foreign resident
In 2018 Morris also identified an interstellar “immigrant” living in our solar system.
For billions of years, it lived in our solar system without us knowing it was there. But this object could not remain hidden around Jupiter forever. It was just quirky, what the researchers noticed.
Researchers have named this exo-asteroid 2015 BZ509. It is known as the exo-asteroid because it originated outside of our solar system.
At first glance, the 2015 BZ509 is one of several objects orbiting the gas giant Jupiter in a stable configuration, called a renaissance. Although all the planets and most of the objects in our solar system orbit around the Sun, moving in the same direction, the exo-asteroid moves in its own way. With its retrograde orbit, the BZ509 2015 moves in the opposite direction.
Morris wrote in 2018: “Asteroids and Jupiter take the same amount of time to complete an orbit around the Sun, but one is moving clockwise and the other is counterclockwise, so they are two for each other.” Bars go by. ” Repeats forever, this is a static configuration, only in a simplified model with the Sun, Jupiter and the asteroid. We note that when we include other planets, it is more stable than the age of the solar system. “
That orbit is the path in which the object always travels, that is, it could not be done in our solar system. If it were native to our solar system, it would have obtained direction from the gas and dust that formed all the other planets and objects. Morris believed that, like newly discovered alien asteroids, it was also captured during the early stages of our solar system.
The exo-asteroid serves as a warning for objects that may enter our solar system.
Mora said: “If they pass, they can also be captured in a stationary orbit, since this is the case of the BZ509 2015.”
