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

Isotopic fingerprints in lunar, terrestrial, and meteorite samples show Theia formed in the inner Solar System, likely near ...

A new study shows the mysterious impactor probably formed in the inner solar system, right next to early Earth.

For that purpose, 3I/ATLAS must arrive within Jupiter’s radius of gravitational influence — the so-called Hill radius, inside ...

Ahead of 3I/ATLAS’s perihelion on October 29, Harvard astrophysicist Avi Loeb speculated that the day would be a ‘black swan ...