CAPE CANAVERAL, Fla. — Last year, astronomers confirmed that Comet 3I/Atlas is likely the oldest interstellar visitor we’ve observed, possibly up to 11 billion years old—more than twice the age of our sun.
This ancient comet is believed to have formed in a cold, distant part of the galaxy, likely a region that hasn’t developed into a solar system of its own. A team from the University of Michigan utilized the ALMA observatory in Chile to study the comet last fall. Discovered in the summer, it traveled quickly—passing Mars in October and coming closest to Earth in December—before heading out of our solar system for good.
One standout finding is the high levels of deuterium, a heavy form of hydrogen, in the comet’s water. According to Teresa Paneque-Carreno from the University of Michigan, this suggests that the comet originated in a much colder area. While our sun was forming amid other stars, 3I/Atlas may have come from a more isolated environment, contributing to its colder conditions.
The exact origin of this comet remains a mystery. However, Hubble Space Telescope observations estimate its size to be between a quarter-mile and 3.5 miles (440 meters to 5.6 kilometers) across. It’s racing away at an astonishing speed of 137,000 mph (220,000 kph).
Experts believe that understanding comets like 3I/Atlas offers insights into the early conditions of planet formation. Each new discovery adds a piece to the puzzle of our cosmic history.
The first known interstellar object—Oumuamua—was spotted in 2017, followed by Comet 2I/Borisov in 2019. These discoveries challenge our understanding of the universe and how it evolves.
The study’s results were published in Nature Astronomy and highlight the diverse environments from which celestial bodies can originate. As we explore further, we might uncover even more secrets about the universe we live in.
For more information about interstellar comets, you can check out NASA’s resources on comet research.
Source link
Meteors and meteorites, Astronomy, Planets, Space exploration, Latin America, Florida, HI State Wire, FL State Wire, Hawaii, Science, Teresa Paneque-Carreno, Stars
