By Sen. Dennis Linthicum
A recent Wall Street Journal book review, “When the Earth Had Two Moons,” by Erik Asphaug, starts with:
“If you visited the surface of the Earth 4.5 billion years ago, you wouldn’t recognize it. The newly formed planet was still cooling from its recent coagulation. There was a hot rocky surface (probably; we don’t know for sure), volcanoes (again, probably) and a steamy atmosphere (maybe). It seems unlikely that even the…