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

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

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

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

The James Webb Space Telescope spotted signs of solid minerals. These are known as silicon monoxide, beginning to cool and ...

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

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

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

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

The newly discovered world — a "sednoid" — challenges what planetary scientists thought they knew about the edge of the solar ...