A visitor from another star system just passed through our cosmic neighborhood, and NASA has the clearest pictures yet to prove what it actually is: an ancient, icy rock—not an alien spacecraft, despite what the internet's more creative corners were suggesting.
On November 19, NASA released detailed images of 3I/ATLAS, the third known interstellar object ever spotted entering our solar system. The comet arrived unannounced in July, discovered by the Asteroid Terrestrial-impact Last Alert System (ATLAS) observatory. It poses no threat to Earth—it will pass no closer than 170 million miles away—but it did swing within 19 million miles of Mars in October, giving three NASA spacecraft a rare chance to study it up close.
Image: NASA/Goddard/LASP/CU Boulder
The comet traveled at roughly 137,000 miles per hour when first spotted, but the sun's gravity accelerated it to 153,000 miles per hour by its closest approach on October 30. As it approached our star, the James Webb Space Telescope, the Hubble Space Telescope, and NASA's LUCY spacecraft all trained their instruments on the visitor. The resulting images show something distinctly bluer than our sun—a detail that sparked online conspiracy theories when the comet appeared to change color. It hadn't. The coma, the halo of gas and dust surrounding the icy nucleus, simply brightened as the comet drew nearer to the sun's heat.
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A window into the deep past
What makes 3I/ATLAS genuinely remarkable isn't what it isn't—it's what it tells us about the universe's age and complexity. Based on its observed speed and trajectory, astronomers believe the comet likely originated from a solar system far older than our own, possibly billions of years older. It's a physical sample of another star's neighborhood, a messenger from deep space that traveled across the vast distances between stars to reach us.
"It expanded people's brains to think about how magical the universe could be," said Dr. Tom Statler, NASA's lead scientist for solar system small bodies, during the announcement. "It's a window into the deep past."
Image: NASA/JPL-Caltech/University of Arizona
NASA continues to receive data from satellites and space probes, and the James Webb Space Telescope will remain the primary tool for studying 3I/ATLAS as it heads back into the depths of interstellar space. This will be its only pass through our solar system—a brief, ancient visitor that reminded us the universe is far stranger and more generous with its mysteries than any conspiracy theory could imagine.
