New interstellar object 3I/ATLAS: Everything we know about the rare cosmic visitor

image via Space.com

July 7, 2025, 10:15 AM

• •3I/ATLAS is the third known interstellar object to enter our solar system.
• •Its trajectory and eccentricity confirm it is not bound by the sun's gravity.
• •3I/ATLAS is much larger than previous interstellar objects.
• •It will not strike Earth and will be closest on Oct. 29.
• •While not visible to the naked eye, it should be a target for amateur astronomers.
• •The Vera C. Rubin Observatory could discover many more interstellar objects.

Astronomers have discovered 3I/ATLAS, the third interstellar object, which is significantly larger than its predecessors. Its trajectory indicates it's not bound by the sun, confirming its interstellar nature. While it will not pose a threat to Earth, it will come close to both Mars and the sun, making it a target for observation. The discovery of 3I/ATLAS and the potential for more detections highlight advancements in space observation and offer new opportunities for understanding other star systems.

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