About 4.5 billion years ago, a colossal impact between the young Earth and a mysterious planetary body called Theia changed ...

Moon’s precursor planet, Theia, disappeared billions ago, leaving scientists no direct chemical evidence to support the ...

Astronomers might have found evidence of a structure located farbeyond Neptune, potentially giving us clues about the solar ...

Where did the planet the size of Mars that crashed into Earth billions of years ago come from? Theia has captured the ...

"The most convincing scenario is that most of the building blocks of Earth and Theia originated in the inner solar system.

New research suggests that Theia, the object whose collision with Earth is theorized to have caused the formation of the moon ...

Astronomers observing 3I/ATLAS have detected sharply focused, sunward-facing jets unlike anything seen in normal comets, ...

An interstellar trespasser known as 3I/ATLAS is almost certainly a comet. So, why do so many people think it's ...