Scientists traced the Moon's parent planet Theia to the inner Solar System, solving a 4.5-billion-year mystery.
New research suggests Earth's Moon formed from the catastrophic collision of our planet with its "sister" planet, Theia, born nearby. This "sibling" planet theory, supported by iron isotope evidence, ...
Space has a knack for bending our sense of scale. The Moon feels close enough to touch—after all, we see its craters with ...