According to a new study published in the Astrophysical Journal Letters, the carbon atoms that form part of all life on Earth may have traveled outside the galaxy first.
Carbon is the basis of all life on Earth. It originates within stars through nuclear fusion and disperses into the universe when these stars collapse like many other elements on the periodic table. Researchers have demonstrated the complex pathways carbon and other elements travel to arrive at their ultimate destinations when their parent star releases them.
Carbon atoms traveled on a conveyor belt to our galaxy
Carbon and the other elements that form deep within stars travel along currents acting as conveyor belts, transporting them far beyond their native galaxy.
The team studied the conveyor belts, called the circumgalactic medium (CGM), by utilizing the Hubble Space Telescope’s Cosmic Origins Spectrograph. The multitude of gases in adjacent galaxies affects the illumination that quasars emit. The CGM moves gases out of the galaxy and then pushes them back in. There, gravity can form them into material like planets and asteroids.
“Think of the circumgalactic medium as a giant train station: It is constantly pushing material out and pulling it back in,” the study’s lead author, Samantha Garza, a University of Washington (UW) doctoral candidate, said in a press release. “The heavy elements that stars make get pushed out of their host galaxy and into the circumgalactic medium through their explosive supernovae deaths, where they can eventually get pulled back in and continue the cycle of star and planet formation.”
The observation that elements are extracted from the galaxy and later reintegrated, suggests that the carbon constituting our being followed the same circumgalactic medium path, exiting the galaxy before returning to the region where Earth eventually formed.
This concept of elements traversing a specific trajectory enhances our comprehension of galactic formation and human origin.
According to the study, the CGM is a giant storage unit for a galaxy’s oxygen and carbon supply. CGM keeps it constantly stocked with the necessary materials to form planets, asteroids, and stars.
“We can now confirm that the circumgalactic medium acts like a giant reservoir for both carbon and oxygen,” said Garza. “And, at least in star-forming galaxies, we suggest that this material then falls back onto the galaxy to continue the recycling process.’
Further investigations of CGMs could reveal how they work and how the items within galaxies are created.
“If you can keep the cycle going—pushing material out and pulling it back in—then theoretically you have enough fuel to keep star formation going,” Garza said.
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