A rare comet from another star system is revealing just how different alien solar systems may be from our own.

We are living in a golden age of Milky Way research and exploration. When you purchase through links on our site, we may earn an affiliate commission. Here’s how it works. The Milky Way is a barred ...

The presence of deuterium, an isotope of hydrogen, in 3I/ATLAS suggests the interstellar comet formed in a much colder place ...

This particular star system, dubbed Loki after the Norse god of trickery, was consumed by our own solar system billions of ...

We already knew interstellar comet 3I/ATLAS came from somewhere far beyond our solar system. Now scientists have more ...

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Antarctic ice contains evidence that Earth entered an interstellar dust cloud more than 40,000 years ago 1. As the Solar ...

Astronomers analyzed the vapors coming off the comet when it neared the sun and found it had a lot of "heavy" water. That hints it grew up in a frigid planetary system, possibly before its home star f ...

A new study suggests that the comet that rambled past us from another star last year likely originated in a cold, isolated corner of the galaxy that had yet to gel into its own solar system.

Astronomers have discovered something surprising about planets beyond our solar system. Even though planets are incredibly common—scientists now estimate there is at least one planet for every star in ...