Is there a massive undiscovered planet on the outer reaches of the solar system? The idea has been around since before the ...

The astronomers observed hot minerals just beginning to solidify – the first specks of planet-forming material, the ...

Nearly a month ago, a mysterious object was seen hurtling through the solar system and later confirmed as an interstellar ...

Analysis of an ancient meteorite suggests that rocky planets both near and distant from the sun may have formed at the same ...

The celestial body's unusual orbit “implies that something extraordinary occurred" in the early days of the solar system—and ...

Astronomers have discovered the earliest seeds of planets forming around HOPS-315, a baby star located 1,300 light-years away ...

International astronomers have for the first time witnessed the birth of a planetary system beyond Earth's sun that could one ...

Scientists have been able to recreate the extreme conditions found on icy moons in deep space—and revealed the unstable ...

The answers to those questions depend on how we define the death of the solar system.

For Harold Kozak, one of life’s greatest pleasures is the opportunity to educate the public about the stars and the vast ...