What can a piece of debris from another star tell astronomers about planets they may never see directly? The answer has changed dramatically since the first confirmed object from another star crossed ...

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Far from the planets and familiar constellations, an interstellar visitor is pulsing with a rhythm that looks uncannily like a heartbeat. As its brightness rises and falls in a steady cycle, ...

2025 was a year packed with scientific discovery, with stories as large as the galaxy and as small as the DNA from a 24-million-year-old rhinoceros tooth (albeit an extinct one). In between, there ...

A mysterious comet from beyond our solar system is giving astronomers a rare glimpse into alien worlds — and it may have ...

When some scientists and conspiracy theorists saw the strange trajectory of the space object 3I/ATLAS, some of them thought one thing: aliens. With a bizarre shape, an unusually precise trajectory, ...

An interstellar comet that has captivated astronomers this year narrowly missed becoming the first object named after the ...