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An interstellar visitor from beyond our solar system, comet 3I/ATLAS, will make its closest approach to Earth in 2026, offering a rare glimpse into the formation of comets and distant planetary systems.Arlington Today
On December 19, 2026, the interstellar comet 3I/ATLAS will make its closest encounter with Earth, captivating astronomers and space enthusiasts alike. This will be only the third confirmed interstellar object to venture into our solar system, following 1I/’Oumuamua and comet 2I/Borisov. While 3I/ATLAS will maintain a safe distance of approximately 168 million miles from Earth, its approach will allow scientists to study the comet’s nucleus and gain insights into the formation of comets and planets around other stars.
Why it matters
The arrival of 3I/ATLAS represents a rare opportunity for scientists to study an interstellar object up close. As the comet nears the Sun, the heat will cause the release of dust and gases, providing a unique glimpse into the building blocks of distant solar systems. This global collaboration between space agencies and observatories will advance our understanding of the formation and evolution of comets and planetary systems beyond our own.
The details
3I/ATLAS is only the third confirmed interstellar object to enter our solar system. As it approaches the Sun, the heat will cause the release of dust and gases, allowing astronomers to study the comet’s nucleus and gain insights into the formation of comets and planets around other stars. Space agencies and observatories around the world have focused their attention on this visitor, with the Hubble Space Telescope and JUICE Jupiter probe recently capturing breathtaking images of 3I/ATLAS during its swift journey through our inner solar system.
On December 19, 2026, 3I/ATLAS will make its closest approach to Earth, at a distance of approximately 168 million miles.In the past few months, space agencies and observatories worldwide have focused their attention on this interstellar visitor.
The players
3I/ATLAS
An interstellar comet that is only the third confirmed interstellar object to venture into our solar system.
Hubble Space Telescope
A space-based observatory that has captured breathtaking images of 3I/ATLAS during its journey through our inner solar system.
JUICE Jupiter probe
A European Space Agency mission that has also observed 3I/ATLAS as it passes through our solar system.
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What they’re saying
“This is a rare opportunity to witness a cosmic traveler from beyond our solar system, right from the comfort of our homes.”
— Gianluca Masi, Virtual Telescope Project
What’s next
A free livestream hosted by Gianluca Masi at the Virtual Telescope Project will allow viewers to follow the comet’s close approach on December 18 at 11 p.m. EST (December 19 at 0400 GMT).
The takeaway
The arrival of 3I/ATLAS represents a unique chance for scientists to study an interstellar object and gain insights into the formation of comets and planetary systems beyond our own. This global collaboration between space agencies and observatories will advance our understanding of the universe and inspire public interest in the wonders of astronomy.