Which evidence of the giant impact theory suggests that earth and the moon may have once been in the same place?
One evidence that supports the giant impact theory and suggests that Earth and the moon may have once been in the same place is the similarities between their isotopic compositions. Isotope ratios in certain elements, such as oxygen, have been found to be remarkably similar between Earth and moon samples brought back by various lunar missions.
This similarity in isotopic compositions suggests that the moon and Earth share a common origin, arising from the same region of the Solar System. According to the giant impact theory, a Mars-sized body collided with the early Earth, and the ejected debris from this collision eventually formed the moon. This violent impact would have resulted in a mixture of material from both the impactor and early Earth, leading to the similarities observed in their isotopic compositions.