A Martian seismic mystery Meanwhile, the team working on InSight’s seismometer is also keeping busy. On Dec. 16, the group
[I see that gravity remains a mystery. I wrote about it in Hollow Planets in 1999, and indeed, as I
I’m pleased to be giving away this book.Of all the books I read on the Hollow Earth, this one by Marshall Gardner in 1923 was one I used a lot. To me, this was the best of all the old books written on the subject. I was so impressed with this old book that my goal was to write a new book that could finally take its place, and that resulted in my book Hollow Planets.
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