An alien comet passing through our solar system made its closest approach to Mars recently, and two European robotic spacecraft orbiting the red planet turned to take a look.

New images of the 33-million ton interstellar object confirmed it is releasing a nickel alloy commonly used in the aerospace ...

Comet 3I/ATLAS is the third interstellar visitor and continues to be a treasure trove of information about the condition of ...

Astronomers are watching a new comet pass through our solar system with great interest. Based on its glow, the 33-billion-ton ...

Astronomers just caught a rare glimpse of an interstellar comet as it zoomed past Mars. Images of the object, dubbed 3I/ATLAS ...

What makes 3I/ATLAS especially intriguing is that the comet might be three billion years older than our entire Solar System.

The European Space Agency's two Mars orbiters take their shot at getting pictures of the exotic interstellar comet 3I/ATLAS.

Analyses of its emissions using NASA’s Neil Gehrels Swift Observatory indicate that the interstellar comet probably has a very different structure than comets in the solar system.

But over the summer, 3I/ATLAS, has plunged toward the inner solar system—and the fireworks show has begun in earnest. When ...

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Observing 3I/ATLAS in this active phase will give some of the clearest insights yet into the mystery of interstellar comets.

An interstellar visitor is zipping through the Milky Way, and a team of Michigan State University researchers is keeping ...