Mercury’s outer layers may have been stripped off by a young Venus

Mercury is mostly iron, which may be because a series of close encounters with a young Venus billions of years ago stripped away its rocky outer layers

Source:
https://www.newscientist.com/article/2229021-mercurys-outer-layers-may-have-been-stripped-off-by-a-young-venus/?utm_campaign=RSS%7CNSNS&utm_source=NSNS&utm_medium=RSS&utm_content=home