A team of astronomers claims to have sniffed out a “biosignature” in the atmosphere of a distant planet called K2-18b. But not everyone agrees that it signals life. An illustration shows what ...

A newly analyzed planetary system has turned up a world orbiting at such a skewed angle that it defies the neat textbook ...

This is an archived article and the information in the article may be outdated. Please look at the time stamp on the story to see when it was last updated. NEW YORK (AP) — A new Tatooine-like planet ...

About 4.5 billion years ago, Earth had a violent neighbor. A young, still-forming planet named Theia slammed into our world with enough force to melt vast portions of its mantle and scatter a huge ...

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Scientists have observed a “rogue planet” that is growing at an alarming rate as it gobbles up six billion tons of gas and dust every second, a new paper revealed. The newly studied object, formally ...

Astronomers have long believed that “water worlds,” planets rich in water and ice, were among the most common in our universe. This view has shaped much of our understanding of planetary formation and ...

Natural glass found only in Australia could be evidence of an unknown, ancient asteroid impact, researchers say. A new analysis of impact-created "tektites" points to a powerful collision millions of ...

This week's science news was led by a spate of climate stories that were as worrying as they were fascinating. Topping the bill are microbes that were woken up after lying frozen in the Alaskan ...