Mystery of Galaxy

Welcome to my blog "Mystery of Galaxy". Today our topic is "origin of our Moon". Our Moon is weird. At 1% of Earth's mass is the largest satellite relative to its planet. It orbits at a large distance from the Earth and its orbit is tilted from both the Earth's equator and from the plane of Earth's orbit around the Sun. Samples returned from the Apollo missions show that despite its appearance the Moon is chemically and identical twin of Earth. These findings sparked a new debate over how the Moon was formed. Planetary scientists quickly converged on the idea that the Moon formed from a collision between the still forming proto-Earth and a Mars-sized protoplanet. This is the Giant Impact hypothesis and it's been the favored explanation for the Moon's formation for the last 50 years.  Giant Impact hypothesis Source: NASA/JPL-Caltech/T. Pyle (SSC) / Public domain But the Giant Impact doesn't really hold up too well under close...