A comet that traveled from beyond our solar system just swung past Mars, and NASA's spacecraft caught it on camera. The object, called 3I/Atlas, is only the third confirmed visitor from another star system ever detected in our cosmic neighborhood — which is why three Mars orbiters and European Space Agency satellites all pointed their instruments its way last month.
The comet came within 18 million miles of Mars, close enough for detailed photographs. It's somewhere between 1,444 feet and 3.5 miles across — scientists are still narrowing down the size — and it's moving fast. By mid-December, it will make its closest approach to Earth at 167 million miles away, then slingshot back out of the solar system forever.
"Everyone that is in control of a telescope wants to look at it because it's a fascinating and rare opportunity," said NASA's acting astrophysics director, Shawn Domagal-Goldman. The excitement makes sense. We don't get many chances to study material that formed around a different star.
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What makes 3I/Atlas genuinely strange is what it might tell us. Early observations suggest it came from a star system older than our own — possibly much older. "That means that 3I/Atlas is not just a window into another solar system, it's a window into the deep past and so deep in the past that it predates even the formation of our Earth and our sun," said NASA scientist Tom Statler.
Think about that for a moment. This chunk of rock and ice has been traveling through the vacuum for billions of years, and it just happened to pass through the part of space where we happen to exist, at the exact moment we had the telescopes to see it.
The European Space Agency's Juice spacecraft, currently en route to Jupiter, has also been gathering data on 3I/Atlas, particularly after it made its closest pass to the Sun. That data won't arrive until February — Juice's main antenna doubles as a heat shield and can't transmit while protecting the spacecraft — but the observations are being stored for analysis.
NASA has also addressed the inevitable: no, this is not an alien ship. It's a natural object, born from the dust and ice around a distant star. The agency remains genuinely interested in finding life elsewhere in the universe, but this particular visitor is just a rare, ancient wanderer passing through.
