Astronomers have observed an object that originated from beyond our solar system, thought to be an interstellar comet, speeding through our celestial neighborhood.

Until now, very few massive objects in the solar system have been found beyond the Kuiper Belt. Related: An illustrated diagram of the sun and the planets of the solar system.

A diagram shows the projected trajectory of the interstellar comet 3I/ATLAS, labeled C/2025 N1 here, as it travels through our solar system. NASA/JPL-Caltech ...

A diagram of the heliosphere shows the solar system with the solar wind and sun’s magnetic field flowing out to meet the interstellar medium.

Diagram showing the path of A/2017 U1 through the inner solar system. [Diagram: NASA/JPL-Caltech] According to Space.com, when it was first observed, scientists at first assumed it was a comet but ...