A new study suggests yet another theory for a possible extra planet in our solar system, likely of a size between Mercury and ...

About 4. 6 billion years ago, the Solar System formed from a cloud of dust and gas collapsing in on itself due to gravity.

Thirty years ago, on a crisp October day in 1995, two Swiss astronomers changed the course of cosmic history. Michel Mayor ...

Comets SWAN and Lemmon will both swing by Earth and appear bright in the sky near the end of October. Here’s how to see them.

On October 6 1995, at a scientific meeting in Florence, Italy, two Swiss astronomers made an announcement that would transform our understanding of the universe beyond our solar system. Michel Mayor ...

"It was just a matter of time before we found them." ...

For millions of years, a frozen traveler drifted in silence through the stars, carrying secrets from another world. This ...

Anyone who studies planetary formation would relish the opportunity to get a close-up look at an interstellar object. Sending a mission to one would undoubtedly yield a scientific payoff. There's a ...

For millions of years, a fragment of ice and dust drifted between the stars—like a sealed bottle cast into the cosmic ocean.

A new peer-reviewed study finds that early planet formations were assembled from fragments of earlier bodies within the Solar System.

A study led by Howard Chen looks to explain what NASA space telescopes are missing in the search for life beyond Earth.

Exoplanet hunters Christopher Watson and Annelies Mortier explain the long search for a 'twin Earth' capable of sustaining ...