A Science.com article says Earth was hit by "a Mars-sized object ... about 4 billion years ago ... The theory goes back to the 1970s and is well established..." Velikovsky was vilified in the 1950s for theorizing about a planetary collision within historical memory (see my Worlds in Collision post), but this article indicates such a thing is at least possible. Read the article HERE.Lagrangian points
I am fascinated by Lagrangian points, mentioned in the article. This is something new to me, but it makes perfect sense. Click on "View It" below the diagram and see the easy-to-understand explanation.
Lagrangian points exist in any two-body system. This presentation shows how it works with the Earth-Moon system. View It.
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