Return to The Moon (idea)

How did the moon come into existence?

Analysis of data from the [Lunar Prospector] [spacecraft] in [1999] [back]s the long existing [theory] that the Moon masses were ripped away from young [Earth] when an object the size of [Mars] ran into it. Parallels in the [mineral] composition of Earth and the Moon hint at a [common] [origin]. This [similarity] was already known. In the past, some scientists have translated this into an indication that Earth and the Moon had formed separately from the same [cloud] of rocks and dust.

The recent Lunar Prospector data shows however that the Moon has a [small] [core] that contains less than 4% of the Moon's total mass. Earth's [iron] core contains approximately 30% of the planet's mass. If Earth and the Moon had merely formed from the same [blur] of rocks and dust, the Moon would have a core [comparable] in [proportion] to Earth's, scientists claim. A much more [liable] [thought] is that a large body struck Earth, forcing a [release] of [rocky] matter from the outer shell into [orbit], which collected to form the Moon.